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BD34701KS2 - 7.1ch Sound Processor with Micro-Step | ROHM
BD34701KS2

BD34701KS2 - 7.1ch Sound Processor with Micro-Step | ROHM

The ROHM BD34701KS2 is a 7.1-channel surround-sound processor with eight independent volume channels, built-in micro-step volume control, and an operating supply range of 6.5 V to 7.5 V. The device is packaged in a 52-pin SQFP-T (10 mm × 10 mm) surface-mount package and supports I2C-oriented control for audio-system integration. An audio processor is a specialized interface IC that receives multiple audio signals and applies channel routing, attenuation, and volume-control functions before the signals reach amplifiers, speakers, or downstream codecs. The BD34701KS2 belongs to the broader audio signal-processing hierarchy that includes audio processors, audio codecs, mixers, and surround-sound processors. The BD34701KS2 provides an eight-channel independent volume system that can be configured for 7.1-channel surround operation. Its micro-step volume function is intended to reduce switching shock noise during volume changes, supporting cleaner transitions in consumer audio equipment. The device also includes an eight-channel input-selector architecture, dual input selection for zone 2, and multi-channel input capability. Eight independently adjustable channels make the processor useful when several audio paths must receive different attenuation levels. Instead of relying on a separate volume-control stage for every output, a system can centralize channel selection and level control within the processor and control the configuration through its serial interface. The 52-pin package integrates the associated control and signal connections into a compact square surface-mount footprint. Typical applications include 7.1-channel home-theater systems, multi-zone receivers, active speakers, automotive audio head units, and other multichannel amplification systems. The operating range of 6.5 V to 7.5 V suits equipment using a regulated 7 V-class audio rail, while independent channel attenuation simplifies calibration across loudspeaker positions. When laying out a board, use the manufacturer's pin description table to assign every pin and preserve the exposed-package land pattern and thermal requirements. Confirm the external component values, interface addresses, and supported channel configuration from the manufacturer datasheet before production release. A separate regulator and decoupling network should provide a quiet 7 V-class rail at the device supply pins. This page summarizes the processor architecture, package characteristics, practical integration considerations, and verified sourcing paths. It also distinguishes the documented BD34701KS2 from unverified replacement parts so design engineers can avoid assuming that a similar audio processor is electrically and mechanically interchangeable.

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BD34704KS2 - 8-Channel 7.1ch Audio Processor | ROHM Semiconductor
BD34704KS2

BD34704KS2 - 8-Channel 7.1ch Audio Processor | ROHM Semiconductor

ROHM Semiconductor BD34704KS2 is an 8-channel analog audio sound processor optimized for 7.1-channel surround systems, operating from a 6.5V to 7.5V supply in an 80-pin SQFP-T80C package. It combines eight independent volume channels, multi-zone audio routing, and micro-step volume attenuation in one signal-processing IC. An audio sound processor is a specialized interface IC that controls signal level, channel distribution, and zone routing between audio sources and amplifier stages. In a home-theater hierarchy, the BD34704KS2 sits between source-selection circuitry and powered speakers or amplifiers. It is designed to support surround-sound channel management while reducing audible transitions during attenuation. The principal features include independent volume control for eight channels, support for 7.1-channel systems, and micro-step volume operation. According to the manufacturer, improved operational-amplifier specifications and optimized element layout support high-quality audio reproduction. Micro-step attenuation is especially useful when reducing channel level, because the finer adjustment steps can reduce switching pop noise compared with abrupt volume transitions. The device also supports multi-zone input selection, allowing one sound processor to serve multiple listening areas or route different source channels to different output groups. This integration can simplify the analog control section of an AV receiver, home-theater controller, or multi-zone audio amplifier while reducing the number of discrete attenuators and routing components required. Typical uses include 7.1-channel home-theater systems, AV receivers, surround-sound amplifiers, multi-zone audio equipment, and other analog audio products requiring eight independently controlled channels. The 6.5V to 7.5V operating range places it in a conventional analog power rail, allowing system-level design around a nominal 7V supply. Layout quality is critical because the manufacturer's product information specifically identifies optimized element layout as part of the device's sound-quality strategy. Place input and output paths away from switching supplies and high-current return paths, maintain symmetrical grounding where practical, and decouple the analog supply close to the device. This product page combines the known 8-channel architecture, 7.1-channel use case, micro-step volume behavior, supply range, and package information with practical guidance for AV receiver, amplifier, and multi-zone audio designs.

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BD34705KS2 - 8-Channel 7.1ch Audio Processor | ROHM
BD34705KS2

BD34705KS2 - 8-Channel 7.1ch Audio Processor | ROHM

ROHM Semiconductor BD34705KS2 is an 8-channel, 7.1-channel surround-sound processor with built-in micro-step volume, a 6.5 V to 7.5 V supply range, and a 64-pin SQFP package. It is designed to provide independent volume control for eight audio channels, allowing a complete surround-sound signal path to be managed by one dedicated audio processor. An audio processor is a specialized integrated circuit that adjusts, routes, or conditions multiple audio channels according to control signals and system settings. Within the broader product hierarchy, the BD34705KS2 is an audio signal processor, then an audio IC, then a mixed-signal semiconductor used in consumer audio equipment. Its multi-channel architecture reduces the need for separate external volume-control stages when implementing 5.1-channel or 7.1-channel playback systems. The most prominent feature is the built-in micro-step volume system. ROHM states that micro-step volume reduces switching pop noise during volume attenuation, which is valuable when channel-level changes must occur smoothly in home theaters, audiovisual receivers, active speakers, and automotive infotainment systems. The independent eight-channel volume structure also supports separate front-left, front-right, center, rear-left, rear-right, and additional surround channels. The device operates from a stated 6.5 V to 7.5 V supply range. This range places it in powered audio-system equipment where a regulated 7.5 V rail is already available and where low-level audio signals can be routed into the processor. Its 64-SQFP package provides a compact surface-mount implementation, although the exact pin names and electrical limits require confirmation from the manufacturer datasheet. Typical applications include 7.1-channel home-theater systems, surround-sound audio processors, multi-zone entertainment equipment, powered speaker control, and other multichannel audio products. The processor can reduce external volume-control component count while providing coordinated attenuation across eight channels, reducing the risk of mismatched level changes and associated audible transients. Designers should confirm the supported input and output signal format, control interface, clocking requirements, decoupling, and exposed-pad connection from the manufacturer datasheet before layout. The 6.5 V to 7.5 V operating range also requires a regulator with adequate headroom and low noise. Placement near the audio signal paths can reduce sensitivity to interference, but analog and digital return paths still need careful grounding. This product page combines verified manufacturer and distributor information with application guidance, pricing context, package details, and a strict assessment of available drop-in alternatives. It also distinguishes documented capabilities from electrical parameters that still require datasheet verification, helping engineers make sourcing and design decisions without unsupported assumptions.

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BD3481FS-E2 - Stereo Sound Processor IC | ROHM Semiconductor
BD3481FS-E2

BD3481FS-E2 - Stereo Sound Processor IC | ROHM Semiconductor

ROHM Semiconductor BD3481FS-E2 is an analog stereo sound-processor IC with a 4-channel input selector, gain amplifier, primary stereo volume control, four-channel fader volume, two-band equalizer, and an 8.5 V supply capability. The device is packaged in a 20-pin SSOP with a 0.8 mm pitch and combines several analog audio functions without requiring a dedicated microcomputer control interface. A sound processor is an integrated circuit that conditions and routes audio signals within a compact audio system. Its functional hierarchy is analog audio IC, sound processor, audio channel, and integrated circuit. By combining channel selection, amplification, level control, and equalization, this type of device reduces the number of discrete analog blocks required in compact consumer-audio equipment while allowing the product design to remain primarily analog. The BD3481FS integrates a stereo four-channel input selector, a gain amplifier, a stereo primary volume stage, a four-channel fader stage, and a two-band equalizer. These blocks support source selection and level adjustment within one package. The manufacturer documentation also describes the device as suitable for designs where microcomputer control is unnecessary, reducing control-software complexity compared with a software-commanded audio processor. The BD3481 family shares a documented architecture with BD3482FS. Both are described as sound processors containing a stereo four-channel input selector, gain amplifier, stereo primary volume control, four-channel fader volume, and two-band equalizer. The BD3481FS-E2 is supplied in a 20-pin, 0.8 mm-pitch SSOP, making compact analog-audio board layouts possible where component height and lead pitch are important constraints. Typical uses include compact stereo systems, radio equipment, cassette-style audio products, televisions, portable audio equipment, and other consumer products requiring analog source selection and volume control. The integrated architecture is particularly useful when several input sources must be selected and adjusted without relying on a system controller for routine signal-path operations. The principal design task is preserving clean signal routing through a dense analog network. Decoupling, grounding, input-source isolation, and control-settling behavior should be evaluated on the assembled board because switching transients and ground-current paths can affect audio performance. The exact pin assignments, recommended component values, supply-current limits, and detailed electrical limits must be taken from the manufacturer datasheet before schematic release. This product page organizes the documented BD3481FS-E2 functionality, packaging information, application guidance, and engineering trade-offs. It also distinguishes the BD3482FS family relationship from a verified drop-in replacement, helping designers avoid assuming that a similar sound processor can be substituted without footprint and functional verification.

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BD3482FS-E2 - 2-Band Audio Processor | ROHM Semiconductor
BD3482FS-E2

BD3482FS-E2 - 2-Band Audio Processor | ROHM Semiconductor

The ROHM Semiconductor BD3482FS-E2 is a specialized audio sound-processor IC identified as a 2-band equalizer, with an 8.5 V operating supply and a 24-pin SSOP package. It is designed for compact audio systems that require local tone shaping within an analog signal path. The -E2 ordering suffix corresponds to the exact ROHM orderable variant shown in current distributor catalogs. An audio special-purpose IC is a type of signal-processing semiconductor used to modify or condition audio signals rather than merely amplify them. The BD3482FS belongs to the broader sound-processor hierarchy, which sits between general-purpose analog ICs and complete audio codec or amplifier solutions. Its two-band equalizer architecture provides separate control over selected frequency regions, making it useful in compact audio equipment, consumer electronics, and embedded sound systems. The device's principal documented attributes are its 2-band equalizer function, 8.5 V supply requirement, and 24-pin SSOP package. These characteristics place it in applications where the system already handles the power conversion and output amplification and needs a dedicated stage for frequency-response adjustment. The 24-pin package also provides a defined interface for external passive networks and control signals. The BD3482FS combines analog audio processing in a dedicated IC rather than requiring discrete filters, amplifiers, and switching networks. That integration can shorten the signal path and reduce the number of separate components needed for basic band control. Exact gain, frequency, attenuation, distortion, and input-impedance limits must be taken from the corresponding tables in the ROHM datasheet when setting the external network and validating signal amplitude. Typical uses include compact stereo systems, auxiliary audio modules, headphone accessories, portable equipment, and other products in which low-frequency and midrange balance may need adjustment. The part can also serve as the tone-control element in a larger signal chain when the system architecture separates equalization from source selection, volume control, and power amplification. For implementation, begin with the ROHM application circuit and preserve the recommended supply decoupling and analog grounding arrangement. Component tolerances, resistor ranges, and capacitor selections affect the attainable band centers and response shape, so their values should be calculated from the manufacturer's test conditions rather than copied indiscriminately between designs. This product guide combines the device identity, package information, application guidance, technical comparison framework, and practical design notes needed for an initial engineering review. Final circuit release should still include schematic review, signal-level verification, stability checks, and confirmation against the current ROHM datasheet and application notes.

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BD3484FS-E2 - 4-Channel BiCMOS Audio IC | ROHM
BD3484FS-E2

BD3484FS-E2 - 4-Channel BiCMOS Audio IC | ROHM

ROHM Semiconductor BD3484FS-E2 is a four-channel BiCMOS tone-control audio circuit in a 32-pin PDSO32/SSOP-32 surface-mount package. Its four-channel architecture and tone-control function place it in the audio special-purpose IC category, where it can process multiple audio paths within a compact control system. The device is identified as RoHS compliant and is offered in a 32-pin package suitable for integration into multi-channel analog audio equipment. An audio special-purpose IC is a dedicated integrated circuit designed to implement a particular signal-processing function that is more specialized than a general-purpose op amp or standard interface converter. In this product category, the BD3484FS-E2 belongs to the broader hierarchy of audio ICs, analog signal-processing ICs, interface ICs, and integrated circuits. Its role is associated with four-channel tone control, allowing an equipment designer to manage multiple audio channels through a dedicated circuit rather than implementing equivalent passive networks and discrete amplification stages independently. The principal identifiable features of the BD3484FS-E2 are its four-channel organization, BiCMOS circuit technology, 32-pin package, and RoHS-compliant construction. BiCMOS combines bipolar and CMOS functions within an integrated circuit, a useful architecture for analog audio systems that need both transistor-level signal handling and low-power logic functions. The 32-pin PDSO32/SSOP-32 package provides a high pin count for multiple channel connections, control interfaces, and support functions while retaining a surface-mount assembly format. BD3484FS-E2 can be evaluated for multichannel tone-control boards, mixer subsystems, active speaker electronics, audiovisual receivers, and other audio products in which four signal paths require coordinated adjustment. Before finalizing a design, engineers should confirm the device’s exact gain, attenuation, frequency-response, control-voltage, supply-voltage, and channel-routing characteristics against the manufacturer datasheet. Those parameters determine whether the circuit topology can be used directly or requires added external components. A practical implementation places the IC close to the audio signal paths and separates high-gain routing from sensitive control circuitry. Short signal traces, stable reference and feedback networks, and appropriate grounding are especially important when the device processes multiple channels. Designers should also confirm decoupling requirements, control-interface logic levels, and the permitted input or output signal range before laying out the printed circuit board. The main engineering trade-off is functional integration. A dedicated four-channel tone-control IC can reduce duplicated discrete circuitry, simplify control layout, and shorten signal paths, but it also creates a design dependency on one IC’s fixed internal characteristics. Validation with representative audio levels and intended control ranges remains essential even when the package and basic channel count are suitable. This product record combines the verified device identity, package information, channel count, BiCMOS technology, RoHS status, source links, application guidance, and sourcing workflow. It is intended to help engineers locate the datasheet, assess board-level suitability, and request current commercial availability without relying on changing marketplace quotations.

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BD3485FS-E2 - 4-Channel Tone Control Audio IC | ROHM
BD3485FS-E2

BD3485FS-E2 - 4-Channel Tone Control Audio IC | ROHM

The ROHM Semiconductor BD3485FS-E2 is a four-channel tone-control audio sound processor built with BiCMOS technology and housed in an SSOP-32 package. Its four-channel architecture allows one IC to process multiple audio paths, while its dedicated tone-control function supports bass and treble adjustment in compact audio systems. An audio sound processor is an integrated circuit that manages selected functions within an audio signal chain. The typical signal path includes an audio source, a tone-control or sound-processing stage, an amplifier, and a speaker or headphones. By combining four processing channels in one package, the BD3485FS-E2 can reduce component count and simplify board routing compared with four separate single-channel controllers. The key characteristics established for this device are its four-channel configuration, tone-control function, BiCMOS construction, and SSOP-32 package. These features make it relevant to multi-zone audio equipment, compact stereo products, portable consumer electronics, and embedded sound systems. The 32-pin surface-mount package also supports automated assembly and provides a defined footprint for compact circuit boards. BiCMOS construction combines bipolar and CMOS transistor technologies within the same integrated circuit. In audio-processing equipment, this approach can support a blend of analog signal handling and digital control functions. Because the BD3485FS-E2 is identified as a dedicated audio-channel IC rather than a general-purpose amplifier, its selection should be based on matching the required channel count, control functions, package, and system-level audio architecture. Typical applications include compact stereo systems, multimedia speaker designs, portable audio equipment, and multi-channel consumer products. The four channels are especially useful when several independently processed audio zones share one circuit board. Designers should also verify the complete electrical interface, recommended external components, control method, and signal levels against the manufacturer datasheet before finalizing a new design. Layout is a central implementation consideration for a four-channel sound processor. Keep input and output routing short, maintain a stable analog ground path, and place required bypass or support components close to their associated pins. Correct decoupling, controlled trace geometry, and clean separation from switching circuitry help preserve audio quality and reduce the chance of unintended noise coupling. This product page combines the confirmed four-channel, tone-control, BiCMOS, and SSOP-32 characteristics with practical selection guidance, application context, PCB implementation notes, and verified source links. It also distinguishes the device from unsupported replacement claims and directs engineers to the manufacturer datasheet for the complete pin, electrical, and application information.

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BD3486FS-E2 - 32-Pin SSOP Audio Processor | ROHM
BD3486FS-E2

BD3486FS-E2 - 32-Pin SSOP Audio Processor | ROHM

The ROHM Semiconductor BD3486FS-E2 is a 32-pin SSOP audio sound processor classified as an audio-channel and sound-processor IC. It operates from an 8.5 V supply, is assembled in a 0.8 mm pitch surface-mount package, and is supplied in tape-and-reel packaging. The device belongs to the broader class of analog mixed-signal audio processing ICs used to condition and route audio signals inside multi-channel sound equipment. An audio sound processor is an audio special-purpose integrated circuit that provides signal-conditioning or channel-management functions beyond those of a basic operational amplifier. Within the product hierarchy, the BD3486FS-E2 can be classified as an audio-channel IC, then a sound processor, then an analog mixed-signal semiconductor, and finally an integrated circuit. This position explains why the device is suited to equipment requiring dedicated audio signal handling rather than general-purpose logic. The BD3486FS-E2 is offered in a compact 32-pin SSOP with a 0.8 mm lead pitch. Its 32-pin arrangement provides access to multiple audio-channel and control connections, making it appropriate for multi-channel audio paths. The package is designed for surface-mount assembly, allowing automated production and compact PCB layouts. Tape-and-reel packaging supports high-volume manufacturing and automated component placement. Because the device is identified by ROHM as a multifunctional gate and sound processor, its practical configuration depends on the signal sources, channel-routing requirements, gain-control strategy, and external support components used in the target circuit. Signal integrity depends on short, properly terminated audio traces, stable reference connections, and decoupling placed close to the device. Component selection and final schematic verification should follow the pin-description table and typical application circuits in the manufacturer datasheet. Typical uses include multi-channel sound processors, audio-channel routing blocks, compact consumer-audio electronics, and equipment that processes several related audio signals. The part may also appear in specialized playback, communication, and control systems where an integrated audio function reduces the number of separate analog components. Input and output signal levels, supported source impedance, and permissible loading must be checked against the manufacturer's electrical limits before layout release. A disciplined design should first map every BD3486FS-E2 pin to its required function, then define the shortest practical signal path between source, processor, and destination. Keep the audio return path continuous, maintain low-impedance supply and reference distribution, and reserve the package's unused or conditional pins according to the manufacturer recommendations. This page also organizes sourcing, comparison, and engineering guidance around the exact BD3486FS-E2 ordering designation. The key practical benefit of the BD3486FS-E2 is its combination of dedicated audio processing, a 32-pin 0.8 mm SSOP footprint, and production-oriented tape-and-reel packaging. Its compact pin count supports integrated channel management while preserving manufacturability. For an engineering selection, confirm signal-path compatibility, operating limits, pin availability, and lifecycle status against the current ROHM datasheet before committing a new design.

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BD3487FS-E2 Sound Processor with Equalizer | ROHM
BD3487FS-E2

BD3487FS-E2 Sound Processor with Equalizer | ROHM

The ROHM Semiconductor BD3487FS-E2 is a sound processor with equalizer functions designed for audio signal conditioning in electronic equipment. The device is offered in a 32-pin SSOP-A surface-mount package and is identified by distributor listings as a ROHM audio amplifier or audio interface IC. Its dedicated equalizer processing allows incoming audio signals to be shaped before amplification, reproduction, or further signal-chain processing. An audio sound processor is an application-specific integrated circuit that manages gain, tone, and other signal-conditioning functions within an audio path. Unlike a general-purpose operational amplifier, which performs linear amplification with externally configured feedback, the BD3487FS-E2 integrates processing functions intended to reduce the component count and board area required for multi-band audio systems. It belongs to the broader hierarchy of audio interface ICs, signal-processing ICs, and semiconductor amplifiers. The principal documented characteristics of the BD3487FS-E2 include its sound-processor and equalizer positioning, a 32-pin SSOP-A package, and a 0.8 mm package pitch indication reported in distributor documentation. Because the accessible manufacturer documentation covers the base BD3487FS device while ordering-code details distinguish the -E2 version, engineers should confirm electrical ratings, pin functions, and control logic against the BD3487FS datasheet and the manufacturer product information before releasing a layout. The integrated equalizer role is the key technical distinction for this device. A fixed or adjustable equalizer can correct frequency-dependent response, flatten source material, compensate for speaker or cabinet characteristics, or create preset tonal curves. When implemented in the BD3487FS-E2, this processing can reduce the number of discrete filters and surrounding passive networks normally required for those tasks, while keeping the audio routing predictable within one package. Typical application areas include home-audio receivers, compact stereo systems, personal audio equipment, powered speakers, and other products that require local tone control before a downstream amplifier stage. The device can also be evaluated in multi-zone audio equipment where several source paths need consistent sound shaping. System-level performance still depends on the surrounding analog network, external component selection, grounding, and the behavior of the downstream power amplifier. For PCB design, the 32-pin SSOP-A footprint requires careful escape routing because the fine pitch limits component access and trace spacing. Place the equalizer-related external components close to their associated pins, maintain a continuous ground reference beneath the analog section, and separate the audio input region from noisy power-conversion stages. Prototype and measure the complete signal chain, including channel separation, gain stability, frequency response, and distortion. This page consolidates the verified product identity, package information, distributor records, application guidance, and design considerations for BD3487FS-E2. It also distinguishes confirmed characteristics from electrical parameters that must be taken directly from the manufacturer datasheet, helping engineers plan sourcing and hardware development without relying on unverified substitute parts.

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BD3488FS-E2 Audio Sound Processor with Equalizer | ROHM
BD3488FS-E2

BD3488FS-E2 Audio Sound Processor with Equalizer | ROHM

ROHM Semiconductor BD3488FS-E2 is an audio sound processor with equalizer, supplied in a 32-pin SSOP surface-mount package on tape-and-reel carriers. The component is intended for electronic audio systems in which an integrated sound-processing stage is needed between source circuitry and an audio output stage. Its exact electrical ratings, control interface, gain configuration, and signal-path behavior must be confirmed against the manufacturer datasheet before design release. An audio sound processor is a specialized analog signal-processing IC. Within an audio system hierarchy, it performs control and conditioning functions such as equalization, which adjusts the relative amplitude of selected frequency bands before signals reach an amplifier or transducer. Unlike a power amplifier, the BD3488FS-E2 is characterized as an audio amplifier or sound-processor component rather than a speaker-output driver, so its suitability depends on the required signal level and downstream circuit architecture. The BD3488FS-E2 combines an audio-specific function with a compact 32-pin SSOP package. This surface-mount format supports automated board assembly while providing a greater number of external connections than a small-outline package with only a few pins. The tape-and-reel presentation is appropriate for production feeding, pick-and-place assembly, and automated inspection. Pin assignments, exposed functions, and electrical limits should be taken directly from the package drawing in the ROHM Semiconductor datasheet. As an equalizer-based sound processor, the device belongs in signal-conditioning paths for consumer audio, compact stereo systems, accessory products, and other equipment that needs controllable tonal adjustment. The useful design question is not only whether the part provides equalization, but also how its input and output signal levels, control method, stability, and supply requirements align with the rest of the signal chain. Those details determine whether the IC is appropriate as a standalone processing stage or as one element in a larger active-speaker architecture. Typical implementation requires a stable supply, suitable input and output coupling or biasing networks, and decoupling close to the power pins. The PCB should preserve the manufacturer’s recommended grounding and trace geometry, while keeping high-gain audio paths away from switching nodes and noisy digital return currents. Grounding and decoupling choices can materially influence noise, channel-to-channel behavior, and the probability of oscillation. Before committing the BD3488FS-E2 to a new PCB, verify the complete pin list, recommended application circuit, absolute maximum ratings, and test-point requirements. Also check that the 32-pin SSOP footprint, assembly tolerances, and tape-and-reel orientation match the production line. The same-package constraint is essential: a functionally similar IC cannot be treated as a drop-in replacement unless its pin numbering and electrical interfaces have been confirmed equivalent. This page consolidates the confirmed device identity, package information, sourcing context, application guidance, and design considerations into an engineering-focused reference. It also distinguishes confirmed product characteristics from parameters that require direct verification in the manufacturer datasheet, helping designers evaluate the BD3488FS-E2 without assuming unverified electrical values or compatibility.

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BD3489FS-E2 - ROHM Sound Processor / Equalizer IC | 32-Pin SSOP-A
BD3489FS-E2

BD3489FS-E2 - ROHM Sound Processor / Equalizer IC | 32-Pin SSOP-A

The ROHM Semiconductor BD3489FS-E2 is a silicon monolithic sound processor IC with integrated equalizer functions, packaged in a 32-pin SSOP-A surface-mount package supplied in tape-and-reel form. It is a dedicated audio signal-conditioning device: the equalizer (tone control) function shapes the amplitude of audio frequency bands, and the surrounding sound-processor logic supports volume, tone, and balance control paths typical of car audio and consumer audio subsystems. An audio equalizer is a passive or active frequency-selective circuit that applies a defined gain to each of several frequency bands. Inside a car head unit or mini system, the equalizer block sits between the source selector and the power amplifier, so the sound processor IC defines the tonal character of the output stage. Its immediate hierarchy is audio signal-processing IC -> sound processor -> equalizer/tone control -> audio subsystem -> consumer and automotive audio equipment. Key packaging and ordering features of the BD3489FS-E2 include the -E2 suffix denoting the RoHS-compliant, embossed carrier-tape-and-reel delivery form, a 32-pin SSOP-A body that suits high-density audio boards, and a single silicon monolithic construction that keeps the external BOM small. Because the equalizer and processor functions are integrated on one die, the board designer can replace discrete filter networks and switching logic with a single IC, reducing assembly cost and improving channel matching between left and right paths. The BD3489FS family is designed for bidirectional stereo processing, with separate control inputs for each channel so that gain settings, tone, and volume can be adjusted independently. Because the device is intended for audio signal paths rather than logic-level logic, its internal stages are optimized for low-noise audio bandwidth operation with a mono/stereo signal flow appropriate for potentiometer or switch control from a front-panel interface. Typical uses include car audio head units, compact stereo systems, radio and cassette-era audio decks, home mini-system amplifiers, and portable or docked audio products where an adjustable tone control is expected in the signal chain. The 32-pin SSOP-A footprint is also attractive for designs that need many control lines but must fit a small PCB. When designing around this part, confirm the exact pin assignment and typical application circuit from the ROHM datasheet before layout, because the control pins of sound processor ICs are frequently routed directly to front-panel switches and dual-gang potentiometers. Reserve filtering and decoupling close to the supply pins, and treat the equalizer band centers and Q factor as fixed by the internal topology rather than user-adjustable. This page adds engineering context beyond the manufacturer datasheet: a structured specification list with explicit data gaps, a same-footprint alternative comparison, six application scenarios with companion component recommendations, and layout and signal-integrity design notes that reduce bring-up risk on audio boards.

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BD3490FV-E2 - 2-Channel Audio Tone Processor | ROHM
BD3490FV-E2

BD3490FV-E2 - 2-Channel Audio Tone Processor | ROHM

The ROHM Semiconductor BD3490FV-E2 is a 2-channel audio sound processor with a built-in 2-band equalizer, operating from a 4.75 V to 9.5 V power supply in a 28-pin SSOP-B package. It is designed for portable stereo systems and is also identified for mini component systems, micro component systems, televisions, and radio-cassette recorders. Its low-current operating approach supports compact audio equipment where supply efficiency, external-component count, and board area are important. An audio sound processor is a functional block within the broader signal-chain hierarchy of audio amplifiers and analog audio integrated circuits. It receives stereo audio signals, applies tone or equalization functions, and passes the processed signals toward an audio power amplifier or loudspeaker drive stage. By integrating a 2-band equalizer into one IC, the BD3490FV-E2 can reduce the number of discrete passive networks and control components required for bass and treble adjustment in compact consumer-audio equipment. The device's headline features include 2-channel processing, a built-in 2-band equalizer, a 4.75 V to 9.5 V compatible supply range, and a low-current Bi-CMOS implementation. The equalizer provides a practical tone-control function within the stereo signal path, while the relatively broad supply-voltage range accommodates conventional low-voltage audio rails. The 28-SSOP-B package is a surface-mount format suited to automated PCB assembly, although its relatively long body requires more board length than a compact leadless package. ROHM describes the BD3490FV family as delivering high-fidelity audio while remaining easy to use. The Bi-CMOS process combines bipolar signal-processing characteristics with CMOS circuitry and is intended to support low-current, low-energy operation. Additional functions cited for the family include a built-in surround function, bass-boost or output-gain implementation with an external component, and behavior suited to changing the volume setting. Detailed signal-path behavior, control logic, and application-circuit values should be confirmed against the manufacturer datasheet before layout is finalized. Typical applications include portable stereo systems, mini and micro component audio systems, television audio paths, and radio-cassette recorder products. These systems benefit from local bass and treble adjustment without allocating a separate equalizer IC. The part can also sit upstream of a power amplifier, where its processed stereo channels provide a tone-controlled source signal while leaving current delivery and loudspeaker drive to the downstream amplifier stage. A key implementation consideration is the interaction among the 4.75 V minimum supply voltage, the external equalizer network, bypass capacitors, and the downstream amplifier input. Place the input, output, and bypass connections according to the manufacturer application circuit, keep analog signal traces short, and isolate the audio path from switching-node and high-current supply paths. Verify termination values, recommended capacitors, control settings, and maximum signal levels against the relevant ROHM documentation. This product page combines the verified device identity, supply range, channel count, equalizer configuration, package information, and application context with practical selection guidance. It also identifies drop-in alternatives only when the package and functional fit can be established, avoiding replacements that require pin or board-layout changes.

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BD3491FS-E2 Stereo Sound Processor | ROHM Semiconductor
BD3491FS-E2

BD3491FS-E2 Stereo Sound Processor | ROHM Semiconductor

The ROHM Semiconductor BD3491FS-E2 is a two-channel analog sound processor with built-in surround-sound functionality, six single-ended stereo input selectors, and an I2C control interface. It operates from a 4.75 V to 9.5 V supply in a 32-pin SSOP-A package. The processor also provides a two-band equalizer, bass boost, output gain, and surround-sound functions implemented with external components. An analog sound processor is an audio signal-processing IC that receives multiple stereo sources, selects the required input, adjusts level and tone, and routes the result into an audio signal chain. It belongs to the broader hierarchy of analog audio processor, audio signal processor, integrated circuit, and semiconductor. This category is useful when a product needs source selection and programmable sound shaping without using a digital signal processor for every adjustment. Six single-ended stereo input selectors allow the BD3491FS-E2 to handle several analog sources while maintaining a straightforward analog architecture. Its built-in input gain controller is intended for mobile-audio applications, where changing the gain of a selected source can simplify front-end design. The volume input terminal can also serve as a microphone input because its impedance remains constant when the volume setting changes. The two-band equalizer provides bass and treble adjustment with a gain range of plus or minus 14 dB in 2 dB steps. This allows the sound character to be tailored without adding a separate equalizer stage. Additional bass-boost, output-gain, and surround functions are realized using external components, providing flexibility between the IC and the surrounding analog network. The Bi-CMOS process supports low-current and low-energy operation while combining bipolar and CMOS circuit characteristics. Typical uses include mobile audio equipment, consumer stereo systems, portable-media products, and other analog audio products requiring multiple source inputs. The I2C interface enables controlled configuration of the device, while the 32-SSOP-A package supports conventional surface-mount assembly. When designing around the BD3491FS-E2, preserve the required input and output network around the external surround components, and verify the signal levels at each selected input before enabling the equalizer or bass-boost functions. The constant-impedance volume or microphone terminal can simplify source switching, but microphone biasing and termination still require appropriate external components. This product record combines the manufacturer feature description, distributor identification, package information, application details, and design guidance in one engineering-focused reference. It also identifies the limited set of same-footprint alternatives and highlights where a complete pin-by-pin, electrical, and lifecycle review is required before substitution.

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BD3805F-E2 Car Audio Sound Processor | Rohm Semiconductor
BD3805F-E2

BD3805F-E2 Car Audio Sound Processor | Rohm Semiconductor

The Rohm Semiconductor BD3805F-E2 is a dedicated car-audio sound processor IC identified by distributor listings under the Audio Special Purpose category. The verified product data describes it as an SCF built-in sound processor for car audio and identifies the -E2 variant as a 22-pin SOP device supplied in tape-and-reel packaging. It is intended for automotive audio systems that require a dedicated signal-processing function rather than a general-purpose audio amplifier. An audio sound processor is an application-specific integrated circuit that processes audio signals inside a vehicle infotainment or head-unit platform. Within the broader semiconductor hierarchy, it belongs to the audio special-purpose IC family, which sits alongside audio amplifiers, codecs, DSPs, and interface ICs. Its exact internal processing functions and electrical limits must be confirmed against the Rohm manufacturer datasheet before schematic capture or firmware configuration. The BD3805F-E2 is specifically associated with car-audio sound processing. The verified distributor listings place it among sound-processor and car-audio amplifier products, while an archived BD3805F datasheet describes the base device as an SCF built-in sound processor for car audio. This makes the part most relevant to designers of vehicle head units, source units, and aftermarket automotive audio control platforms. The -E2 ordering code is associated with the 22SOP tape-and-reel package in the verified distributor record. Package choice remains critical for automotive production because PCB land patterns, pin orientation, soldering profiles, and moisture-handling requirements must match the assembled board. No manufacturer pin-assignment table or complete electrical characterization was present in the supplied verification data. When evaluating this device, engineers should obtain the Rohm BD3805F datasheet and confirm supply voltage, interface topology, supported audio paths, control signals, reset requirements, clocking, and production test procedures. The verified web results provide purchasing and classification data but do not establish detailed operating ratings, so those parameters are marked as data needed rather than estimated. This page consolidates verified distributor classification, lifecycle-sourcing context, package information, comparison limitations, and engineering questions around the BD3805F-E2. Its alternative analysis is intentionally limited to parts supported by the supplied cross-reference evidence, avoiding unrelated audio amplifiers or processors that would require board redesign rather than a true drop-in substitution.

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BD3806FS-E2 Audio Processor | ROHM Semiconductor
BD3806FS-E2

BD3806FS-E2 Audio Processor | ROHM Semiconductor

The ROHM Semiconductor BD3806FS-E2 is an audio special-purpose integrated circuit associated with medium-power linear and switching applications. Verified distributor records identify the component as an audio processor and audio channel IC, while package references vary between 22SOP and SSOP-32. The BD3806FS-E2 therefore belongs to the amplifier and audio-processing portion of the broader integrated-circuit hierarchy, where dedicated audio devices condition, amplify, or route low-frequency signals. An audio special-purpose IC is an integrated circuit optimized for functions such as audio amplification, channel control, signal processing, and drive-stage management. Unlike a general-purpose operational amplifier, an audio processor can incorporate application-specific circuitry intended to simplify multi-channel or medium-power audio designs. The supplied records classify the BD3806FS-E2 specifically as an audio processor, but they do not provide a verified datasheet or internal database specifications for its voltage, current, gain, channel count, frequency response, or protection features. The verified distributor classification is the principal functional attribute available for this part. Its application context is identified as medium-power linear and switching applications, indicating that it is associated with audio power-chain design rather than general signal processing. One supplier describes the device as an audio channel, while another labels it an audio processor. The latter appears repeatedly across distributor records and is therefore used as the primary product description in this data set. Physical packaging must be confirmed before PCB design or procurement. Verified sources contain both “22SOP” and “SSOP32” descriptions for BD3806FS-E2. Because the available records conflict and do not provide a complete manufacturer pinout, no reliable pin numbering or exposed-pad arrangement can be published here. The component should be ordered only after its ordering code, package drawing, lead pitch, and terminal mapping have been checked against the current ROHM Semiconductor datasheet or a distributor-controlled CAD and data sheet. BD3806FS-E2 can be evaluated for consumer audio channels, powered speakers, compact stereo systems, and other medium-power audio products in which the circuit requires an integrated audio function rather than a generic signal-path amplifier. Its precise suitability depends on supply voltage, output topology, channel configuration, thermal dissipation, and required protection, none of which can be confirmed from the supplied web evidence. Engineers should therefore avoid making final architecture or layout decisions from the distributor category alone. The primary design caution is to verify package and electrical data before substitution or assembly. A distributor listing may combine historical LAPIS Semiconductor material with a current ROHM Semiconductor record, and inconsistent package descriptions are present in the evidence. Obtain the authoritative datasheet, confirm the exact ordering suffix, and compare every pin function before compiling a footprint or designing a replacement. Distributor availability should also be checked at order time because the provided search results do not contain a stable inventory count or quoted price table. This page consolidates the verified distributor classifications, package conflicts, sourcing links, and available cross-reference evidence for BD3806FS-E2. It deliberately distinguishes confirmed information from missing electrical data and avoids inventing voltage ratings, pin definitions, pricing, drop-in equivalents, or lifecycle claims that were not supplied by the verified sources.

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BD3808FS-E2 Audio Processor IC | ROHM Semiconductor
BD3808FS-E2

BD3808FS-E2 Audio Processor IC | ROHM Semiconductor

ROHM Semiconductor BD3808FS-E2 is an audio-special-purpose integrated circuit classified by DigiKey as an Audio Channel device and by other distributor listings as an audio processor. The supplied product information identifies a 22SOP package and associates the device with medium-power linear and switching applications. These verified facts place the BD3808FS-E2 in the broader category of audio processing ICs, where dedicated circuitry manages audio signal paths or associated control functions within consumer and industrial audio equipment. An audio processor is a specialized application-specific semiconductor. Unlike a general-purpose logic IC, it is designed around audio-channel requirements, including signal handling, channel control, or functions used to implement an audio system. The BD3808FS-E2 belongs to this audio-special-purpose IC hierarchy, which sits within integrated circuits and ultimately within the semiconductor component category. Its 22SOP package provides the physical interface used to connect the device on a printed circuit board. The verified distributor records distinguish the exact BD3808FS-E2 ordering code from the broader BD3808FS family listing. DigiKey identifies BD3808FS-E2 as an Audio Channel part, while marketplace records describe it as an IC audio processor in a 22SOP package. A distributor description also associates it with medium-power linear and switching applications. These classifications suggest that engineers should review the manufacturer datasheet for the exact channel architecture, electrical limits, external component requirements, and supported signal topology before releasing a production design. From a sourcing perspective, the BD3808FS-E2 is listed across DigiKey, Octopart, and multiple distributor or catalog channels. The verified search results report availability or comparison coverage, but they do not provide numeric pricing, stock quantities, operating-temperature limits, supply-voltage limits, output-current ratings, gain, distortion, frequency response, pin assignments, or package dimensions. Consequently, those electrical and mechanical parameters cannot be safely inferred from distributor category labels and must be confirmed in the manufacturer documentation. Typical design investigation for this device would focus on medium-power audio systems, signal routing, channel management, and mixed linear or switching signal-chain implementations. Whether it is suitable for a particular headphone, speaker, receiver, or auxiliary audio board depends on its documented supply range, channel count, control interface, and electrical performance. Engineers should also verify footprint compatibility, exposed or non-exposed pad details, pin multiplexing, and recommended application circuitry rather than relying only on the 22SOP package name. The main purchasing risk is incomplete verification: the supplied data does not establish lifecycle status, automotive qualification, RoHS or REACH declarations, exact package drawing, or a manufacturer-hosted datasheet URL. Samples and lot traceability should therefore be obtained before substitution. This page distinguishes verified distributor facts from unknown technical fields and avoids presenting estimated electrical ratings as if they were manufacturer specifications. This page adds engineering-focused value by mapping the verified 22SOP package and audio-processor classification to likely design checks, documenting all available source links, and identifying the exact data still required for footprint validation, schematic review, sourcing, and production release. It also explains why an apparently similar BD3808FS order code should not be assumed to be a drop-in alternative without package and pin-level verification.

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BD3809FS - Audio Channel Processor | ROHM Semiconductor
BD3809FS

BD3809FS - Audio Channel Processor | ROHM Semiconductor

ROHM Semiconductor BD3809FS is an audio-channel integrated circuit identified by distributor records as an audio processor in a 22SOP package. The available catalog information describes the device for medium-power linear and switching applications, while the primary distributor listing classifies it under Audio Special Purpose and Audio Channel. These verified identifiers establish the component family and form factor, but the supplied source excerpts do not include a complete manufacturer datasheet parameter table. An audio-channel processor is an application-specific integrated circuit used to process, control, or route audio signals within an audio subsystem. It belongs to the broader hierarchy of audio ICs, analog and mixed-signal semiconductors, and signal-processing integrated circuits. Compared with a general-purpose operational amplifier, an application-specific audio processor may incorporate multiple functions, but the exact internal blocks and signal paths of BD3809FS cannot be confirmed from the supplied excerpts. The verified package identifier is 22SOP. That package provides 22 physical lead positions, but the supplied data does not include a pinout, pin names, exposed-pad information, dimensions, or pin-to-pin replacement cross-reference. The catalogs also identify BD3809FS-E2 as an ordering designation associated with the same device family. Its electrical details, marking code, temperature range, and ordering-code differences require confirmation from the manufacturer datasheet. BD3809FS is associated with audio-channel applications and medium-power linear and switching application descriptions. These descriptions make it relevant to audio equipment, signal-conditioning circuits, and communication equipment where an audio-channel IC is required. However, verified operating voltage, input and output signal range, channel bandwidth, gain, distortion, channel count, control interface, and output-drive specifications are not included in the supplied source data and should not be inferred from the product type alone. Because the available evidence is distributor-oriented rather than a complete technical datasheet, engineers should verify pin functions, supply requirements, timing, absolute maximum ratings, decoupling recommendations, and application circuitry before committing to a design. A replacement should be selected only after confirming the exact 22SOP footprint, pin assignment, control protocol, electrical limits, and signal performance. This page consolidates the verified BD3809FS identity, package, category, distributor availability references, replacement-search evidence, and engineering-selection cautions. It separates confirmed catalog facts from unavailable technical parameters and provides a practical verification path for schematic capture, PCB layout, sourcing, and component-risk review.

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BD3809FS-E2 Audio Processor 22-SOP | ROHM Semiconductor
BD3809FS-E2

BD3809FS-E2 Audio Processor 22-SOP | ROHM Semiconductor

The ROHM Semiconductor BD3809FS-E2 is an audio processor integrated circuit supplied in a 22-pin SOP package. The verified distributor listing identifies the device as an audio processor, while the DigiKey listing categorizes it as an audio channel IC. The component is intended for audio signal-processing equipment where a dedicated integrated circuit is preferred over a discrete implementation of multiple analog and control functions. It is supplied in tape-and-reel packaging according to the verified product listing, with a stated inventory of 4,609 pieces at the referenced distributor as of the verification date. An audio processor IC is a specialized form of signal-processing semiconductor. In the broader hierarchy, it belongs to the integrated-circuit category and is associated with audio-channel processing, interface, and control functions. Unlike a general-purpose microcontroller or DSP, the BD3809FS-E2 is positioned specifically for audio applications. Exact input formats, output stages, control interfaces, gain settings, distortion limits, voltage requirements, and supported channel configurations are not present in the supplied verified data and should therefore be confirmed in the manufacturer datasheet before schematic capture or PCB layout. The verified catalog data provides several practical procurement and assembly facts. The BD3809FS-E2 is offered as an IC AUDIO PROCESSOR in a 22SOP package. One distributor lists its RoHS status as ROHS3 compliant, and another listing describes the component as tape-and-reel packaged. Digikey identifies the part as available from ROHM Semiconductor and provides access to datasheet, pricing, and availability information. These catalog statements make the part searchable as a dedicated audio-channel solution rather than a generic logic or memory device. The BD3809FS-E2 is relevant to audio-system design, including signal-conditioning modules, compact audio interfaces, and equipment requiring a dedicated audio processor. Because the supplied snippets do not disclose the complete electrical architecture, designers should not assume a particular microphone gain, line-level input sensitivity, speaker-drive capability, channel count, sampling format, or supply voltage. The manufacturer datasheet and pinout are the controlling references for those details. A key engineering consideration is that the 22SOP footprint requires PCB design rules appropriate to the exact lead pitch and outline shown in the manufacturer drawing. Confirm pad dimensions, pin numbering, exposed thermal features if any, soldering profile, and recommended ground layout before releasing artwork. Also verify the logic levels, power rails, decoupling requirements, and analog signal routing against the target system architecture. This page consolidates the verified catalog identity, category, package, RoHS statement, packaging format, distributor availability, and engineering-selection cautions for BD3809FS-E2. It also distinguishes verified facts from parameters that still require datasheet confirmation, helping engineers make an initial sourcing decision without mistaking category-level descriptions for full electrical specifications.

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BD3811K1 - 6-Channel 5.1ch Sound Processor | ROHM
BD3811K1

BD3811K1 - 6-Channel 5.1ch Sound Processor | ROHM

The ROHM BD3811K1 is a 6-channel 5.1ch sound processor with integrated mode selection, input selection, 6-channel volume control, gain amplification, bass, treble, and bass boost functions. The device is supplied in an 80-QFP package measuring 20 mm by 14 mm and is designed for home-theater and multichannel audio systems. A sound processor is a dedicated audio-system IC that controls routing, level, tone, and channel-mixing functions before signals reach power amplifiers and loudspeakers. The BD3811K1 belongs to the broader hierarchy of audio special-purpose ICs, audio signal processors, analog and mixed-signal semiconductors, and integrated circuits. Its 5.1ch orientation means that one front-left, front-right, center, surround-left, surround-right, and subwoofer channel can be managed from a dedicated processor. The verified manufacturer datasheet identifies the BD3811K1 and BD3818KS as 5.1ch sound processors with built-in mode and input selectors. For BD3811K1, the integrated functions include 6-channel volume, gain amplifier, bass, treble, mixing through the family architecture, and bass boost. These functions reduce the number of separate analog controls required in a home-theater receiver or powered-speaker system. The available operating-supply indication is 10 V to 14.6 V, supporting conventional internal analog rails found in multichannel audio equipment. The BD3811K1 is identified by distributors as an audio tone processor in the 80-QFP (20 x 14 mm) package. Its pinout, exact control-voltage ranges, signal-frequency limits, total harmonic distortion, noise specifications, and recommended external-component values are not included in the supplied verified dataset. Those values must be taken directly from the manufacturer datasheet before signal-path or thermal calculations are approved. Typical uses include home-theater preamplifiers, 5.1ch surround-sound receivers, powered multimedia speakers, and analog multichannel source systems. The integrated bass, treble, volume, gain, and bass-boost blocks are particularly useful where a shared system-level tone controller is preferable to discrete analog networks. The input and mode selectors can also simplify source routing, although the exact supported modes and input count require confirmation from the datasheet. When designing around the BD3811K1, treat the audio paths, control inputs, supply rails, and ground returns as an analog system rather than as generic digital logic. Keep input and output routing away from switching supplies and high-current amplifier outputs, provide local supply bypassing according to the manufacturer application circuit, and verify the PCB footprint against the 80-QFP drawing before release. This page consolidates the verified distributor listings, manufacturer-hosted PDF, package information, supply-voltage indication, pricing signal, and practical selection guidance for BD3811K1. It also distinguishes confirmed data from parameters that still require verification from the official datasheet, reducing the risk of designing from an incomplete substitute listing.

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BD3812F-E2 - 2-Channel Audio Volume Controller | ROHM
BD3812F-E2

BD3812F-E2 - 2-Channel Audio Volume Controller | ROHM

The ROHM Semiconductor BD3812F-E2 is a 2-channel electronic audio volume controller with 1.2 uVrms residual noise, a 131 dB dynamic range under the IHF-A weighting condition, and independent channel attenuation from 0 dB to -103 dB. The device also provides MUTE operation in 1 dB steps and uses two-line serial control. It is supplied in a 14-pin SOIC package. An electronic volume controller is an audio signal processor that adjusts the level of one or more audio channels through a control interface rather than a mechanical potentiometer. In the product hierarchy, it belongs to the broader class of audio special-purpose ICs, which sit between analog signal-generation blocks and power amplifiers. The BD3812F-E2 is designed to preserve audio signal quality while providing repeatable, software-controlled attenuation for multi-channel audio systems. The BD3812F-E2 supports independent control of two channels over a 103 dB attenuation range. Its mute function changes the level in 1 dB steps, making it suitable for product designs that need fine attenuation control, channel balancing, or user-selected volume settings. When combined with any of the BD3811K1, BD3813KS, BD3814FV, or BD3815KS family members, as specified by ROHM, the common bus supports up to eight channels. The common-bus architecture can also control as many as four chips at the same time. The maximum output voltage is 4.2 Vrms under the stated conditions of VCC = 7 V, VEE = -7 V, and RL = 10 kOhm. This output capability, combined with a residual-noise specification of 1.2 uVrms, supports low-noise audio signal paths. The two-line serial control reduces the number of control connections required compared with a parallel volume-control arrangement, which can also simplify PCB routing and microcontroller interface design. Typical uses include television and monitor audio channels, home-audio systems, active speakers, audio mixers, and multi-zone entertainment equipment. The device is particularly useful where independent left and right attenuation, common-bus expansion, mute control, or precise software-defined volume adjustment is required. Because its operating supply range is specified as 5 V to 7.3 V, the surrounding circuit must provide compatible positive and negative analog rails where the application requires the stated 4.2 Vrms output capability. Designers should preserve the datasheet-specified bypass and output-load conditions when evaluating signal integrity. The 10 kOhm load used for the stated maximum-output condition is relevant to downstream amplifier planning, and any external coupling or amplifier input must not load the output beyond the supported operating conditions. Decoupling should be placed close to the supply pins, and the common-bus wiring of multiple devices should be kept short to minimize coupling between channels. This product data combines the verified ROHM feature description with distributor packaging information, practical multi-channel application guidance, and explicit data-gap markers. It distinguishes verified numeric performance from unreported specifications and does not infer a pin assignment, temperature range, or drop-in substitute that the supplied sources do not confirm.

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BD3813KS-E2 - 6-Channel Audio Processor | ROHM Semiconductor
BD3813KS-E2

BD3813KS-E2 - 6-Channel Audio Processor | ROHM Semiconductor

The ROHM Semiconductor BD3813KS-E2 is a six-channel Bi-CMOS audio signal processor with independent master-volume control, a 129 dB dynamic range, and a 56-pin SQFP package measuring 10 mm by 10 mm. It supports a 0 dB to -95 dB attenuation range in 1 dB mute steps and can produce a maximum output of 4.2 Vrms under the specified dual-supply conditions. An audio signal processor is an integrated circuit that combines multiple functions used to condition analog audio signals. In the broader electronics hierarchy, it belongs to the signal-processing IC and audio-IC classes, where it sits between source or preamplifier stages and power amplifiers. Rather than merely amplifying signals, this device applies volume, tone, and channel-level control while preserving low residual noise and limiting audible switching transients. The six-channel architecture supports independent master-volume adjustment, making the device suitable for systems that must control several audio paths separately. Its resistance-ladder implementation is specifically intended to reduce residual noise and shock sound during switching. The Bi-CMOS process combines bipolar and CMOS characteristics and supports low-current operation. Additional features include two-wire bass and treble control, as listed for the BD3813KS-E2, and a broad 10 V to 14.6 V operating-supply range. The 129 dB dynamic-range specification applies under the manufacturer's stated tone-bypass, muted-volume, and IHF-A conditions. Maximum output voltage reaches 4.2 Vrms when the device operates from +7 V and -7 V with a 10 kohm load. These conditions are important when designing around headroom: the available output amplitude depends on supply voltage, load impedance, signal level, and the selected control settings. Typical applications include AV receivers, home-theater systems, mini-component audio systems, multichannel amplifiers, active speakers, and other 5.1-channel or 6.1-channel equipment. The device is particularly relevant where multiple amplified channels require coordinated volume control, tone adjustment, or electronic attenuation before the final power-amplifier stage. The main design consideration is supply and signal-path planning. Keep the audio input and output routing short, provide clean bypass capacitors at the supply pins, and confirm the external component values required for the intended tone-control network. Because the 56-pin square package has fine-pitch leads and an exposed thermal structure, careful soldering, handling, and PCB thermal design are required. This product overview combines the manufacturer's feature data with package information, application guidance, engineering considerations, and a conservative replacement analysis. It helps designers evaluate signal-chain fit, output headroom, control architecture, and PCB implementation before selecting the BD3813KS-E2 for a multichannel audio design.

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BD3814FV-E2 - 6-Channel Audio Processor | ROHM
BD3814FV-E2

BD3814FV-E2 - 6-Channel Audio Processor | ROHM

ROHM BD3814FV-E2 is a six-channel electronic-volume audio processor designed for bass and treble tone-control functions in audio systems. It operates from a 10 V to 14.6 V supply range, supports a 2-wire control interface, and is packaged in a 40-terminal SSOP-B. ROHM identifies the BD3814FV family as a Last Time Buy product following a discontinuation announcement, so engineers should include lifecycle risk in new-design decisions. An audio processor is an analog signal-conditioning integrated circuit that controls, attenuates, or shapes audio signals between source and amplifier stages. In the broader product hierarchy, the BD3814FV-E2 belongs to audio processors, analog audio control ICs, and integrated circuits for consumer and professional audio equipment. Its electronic-volume function can provide centralized level and tone adjustment without requiring a separate potentiometer or mechanically operated control for every audio channel. The device is identified as a six-channel electronic-volume processor with bass and treble control. These functions are relevant in multi-zone audio systems where different speaker groups require independent attenuation or tonal compensation. The 40-SSOP-B package provides a relatively high pin count for an analog control IC, supporting multiple signal and control connections while remaining compatible with conventional surface-mount PCB assembly. The BD3814FV-E2 uses a 2-wire interface for tone-control functions. This interface-oriented approach is appropriate for systems where several control parameters are handled through a shared control link rather than a large number of discrete analog inputs. System integrators should confirm the exact control protocol, logic levels, timing, and supported commands against the manufacturer datasheet before finalizing firmware or host-controller communication. Typical applications include multichannel amplifier boards, active speaker crossover networks, car-audio tone controllers, home-theater preamplifiers, compact stereo systems, and commercial audio distribution equipment. In a multi-zone amplifier, the processor can be positioned in the signal path ahead of power amplifiers so bass and treble adjustments are handled consistently across the available channels. Its six-channel architecture is especially useful where several speaker zones need coordinated volume and tone control. Because the BD3814FV-E2 family has entered Last Time Buy status, engineers should review the manufacturer product page for lifecycle notices, ordering information, and any applicable change notifications. A robust design should also reserve the footprint for a qualified alternate only after its pinout, control interface, electrical limits, and acoustic behavior have been compared with the original device. This page combines the confirmed product identity, lifecycle information, package details, application context, engineering guidance, and sourcing considerations for the BD3814FV-E2. It is intended to help designers assess whether the device’s six-channel electronic-volume architecture and 2-wire tone-control interface fit a new or existing audio-control board while accounting for its discontinued-family status.

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BD3816K1 - 7-Channel Audio Signal Processor | ROHM Semiconductor
BD3816K1

BD3816K1 - 7-Channel Audio Signal Processor | ROHM Semiconductor

The ROHM Semiconductor BD3816K1 is a 7-channel audio signal processor, also described in distributor listings as a 6.1-channel sound processor, intended for multi-channel audio systems. The device operates from a 10 V to 14.6 V supply according to the Mouser listing and is packaged in an 80-pin QFP measuring approximately 20 mm by 14 mm. Its primary function is to process and route multiple audio channels while providing bass and treble controls, making it suitable for home-theater receivers, amplified speakers, car audio systems, and other multi-zone entertainment equipment. The BD3816K1 belongs to the broader category of audio special-purpose integrated circuits. An audio signal processor is a functional block within the signal-chain hierarchy: source audio enters the processor, control logic and internal circuitry condition the signals, and the processed outputs are sent to amplifiers, speakers, or additional audio equipment. Compared with a simple passive tone-control network, an integrated processor can centralize channel selection, volume, bass, treble, and other system functions while reducing external discrete-component requirements. Verified distributor information identifies the BD3816K1 as a 7-channel audio audio-signal processor and identifies a 2-wire bass/treble control interface. The GlobalSpec result lists a serial interface type, an operating current of 40 mA, and an operating temperature range from -20 C to +75 C. The same source also lists supply-voltage entries of 5 V and a 5 V to 7.3 V range, while Mouser identifies a 10 V to 14.6 V operating range. Because these published entries are not mutually consistent, engineers should confirm the exact electrical limits and recommended operating conditions against the applicable ROHM datasheet before committing a design. The 80-QFP package provides the physical pin count and lead arrangement required for a complex multi-channel audio device, but the supplied search results do not expose a complete verified pinout or internal block description. Use the official or archived manufacturer datasheet for pin assignments, control maps, signal-path details, recommended application circuitry, and electrical characteristics. The device is not a power semiconductor, so a safe-operating-area chart is not applicable. Its design should be evaluated around signal integrity, grounding, supply bypassing, control-bus compatibility, channel routing, and thermal performance in the final enclosure. This page combines verified distributor listings, package information, sourcing links, and engineering caveats without inventing unavailable electrical values.

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BD3817KS - 7-Ch Audio Signal Processor | ROHM Semiconductor
BD3817KS

BD3817KS - 7-Ch Audio Signal Processor | ROHM Semiconductor

The ROHM Semiconductor BD3817KS is a 7-channel audio signal processor with a 10-channel input selector, 0.001% THD+N, and adjustable gain from 0 dB to 7 dB in a 100-SQFP package measuring 14 mm by 20 mm. It is designed for high-fidelity audio systems that require centralized volume control and selection among multiple audio sources. An audio signal processor is an integrated circuit that manipulates or routes audio signals while adding control functions such as channel selection, volume adjustment, or gain control. Within the broader semiconductor hierarchy, the BD3817KS belongs to the signal-processing and power-management electronics used in consumer audio, home-theater, and professional audio equipment. Its combination of seven volume-controlled channels and a ten-source selector reduces the need for separate analog routing components. The principal documented features are seven volume-control channels, ten input-selection channels, 0.001% total harmonic distortion plus noise, and a gain-control range of 0 dB to 7 dB. The 100-SQFP package provides 100 electrical contacts in a relatively compact surface-mount footprint. The verified distributor listing describes the device as an audio signal processor rather than a power amplifier, so it should be positioned upstream of output amplification stages. BD3817KS integrates routing and gain control into one dedicated audio-processing device. A 10-channel input selector can organize multiple source paths, while seven independent volume channels support multi-zone or multi-speaker systems. The stated 0.001% THD+N specification is appropriate for evaluating signal-integrity requirements, although the applicable frequency range, measurement bandwidth, and test conditions are not present in the supplied data and should be confirmed in the manufacturer datasheet before design release. Typical uses include home-theater receiver routing, multi-zone listening systems, professional audio consoles, and other equipment combining several analog sources with independent level control. In a home-theater design, the processor can select among set-top-box, disc, console, and auxiliary inputs before the selected channels feed external amplifiers. In an active-speaker or amplifier platform, the same approach supports separate level adjustment for surround or zone channels. PCB implementation should preserve the analog signal paths associated with each selected channel and provide appropriate grounding and decoupling. The verified data does not state the supply voltage, exposed-pad connection, recommended capacitor values, or exact pin assignments, so these details must be taken directly from the manufacturer datasheet. A 100-pin footprint also requires careful component placement to keep routing short and preserve signal integrity. This product record combines the verified distributor identity, channel configuration, package information, THD+N figure, gain range, sourcing links, and application-oriented design guidance. It also distinguishes documented facts from unresolved parameters that require datasheet confirmation, avoiding unsupported substitutions or misleading drop-in recommendations.

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