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SI3215-GT - Programmable CMOS SLIC/CODEC | Silicon Labs
SI3215-GT

SI3215-GT - Programmable CMOS SLIC/CODEC | Silicon Labs

Silicon Labs SI3215-GT is a programmable CMOS subscriber line interface circuit and codec with integrated ringing and battery-voltage generation. It performs the line-side signaling functions used in voice-over-packet and digital telephone systems, supports software-configurable balanced ringing up to 90 VPK, and generates DTMF tones. The device is available in a 38-pin surface-mount package configuration identified in the Si3215 family documentation as TSSOP or QFN. A SLIC, or subscriber line interface circuit, is the analog and signaling interface between a telephone line and a digital voice-processing system. It forms part of the broader telephony interface hierarchy: SLIC > codec > integrated interface circuit > communications semiconductor. A ProSLIC combines the line-driver, codec, tone generation, ringing-generator, and battery-supply functions into a programmable device, reducing the number of separate components required in a voice endpoint design. The SI3215 supports software-configurable internal balanced ringing up to 90 VPK. The published ringing capability is stated as 5 REN at 4 kft and 3 REN at 8 kft, allowing the ringing load to be tailored to the line length and telephone-network environment. It also provides DTMF generation and comprehensive telephony signaling support, including requirements associated with Japan and China. An integrated DC-DC converter acts as the controller for a buck-boost converter that converts a positive supply into the negative battery voltage required by a conventional telephone line. Dynamic control of the battery voltage allows the converter to reduce the required level for a given operating mode, which can help lower power consumption while maintaining line functionality. The SI3215 family is suited to voice gateways, digital subscriber line equipment, analog telephone adapters, voice-over-IP terminals, embedded telephony systems, and other designs that connect one or more subscriber lines to a digital signal processor or system controller. Programmable operating characteristics make the same hardware platform adaptable to different ringing, battery, and signaling requirements. Careful line-interface design remains essential even though the codec and ringing functions are integrated. The external network, protection, transformer or coupling components, bypass capacitors, and power-conversion components must be selected for the intended voltage, current, ringing, and surge environment. Designers should also review the Si3215 data sheet before migrating a Si3210 design because the manufacturer explicitly identifies hardware and software differences between the two families. This product record combines the Si3215 family capabilities with practical migration, protection, layout, and sourcing guidance. It also distinguishes confirmed drop-in candidates from related family variants, helping engineers narrow the selection without treating package similarity as proof of complete electrical, software, and production compatibility.

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SI3215-KT - 90 VPK Programmable SLIC/Codec | Silicon Labs
SI3215-KT

SI3215-KT - 90 VPK Programmable SLIC/Codec | Silicon Labs

The Silicon Laboratories SI3215-KT is a programmable CMOS SLIC/codec with integrated ringing and battery-voltage generation, supporting up to 5 REN and 90 VPK internal ringing in a 38-pin TSSOP package. It consolidates subscriber-line interface, codec, tone generation, and line-voltage functions into one programmable device for telephone line-card designs. A SLIC, or subscriber-line interface circuit, is the analog front end between a telephone line and digital voice-processing circuitry. A COC, or codec, converts that analog voice signal into a digital PCM stream. The SI3215-KT combines these functions in a programmable CMOS IC, reducing external circuitry while allowing line parameters and signaling behavior to be configured through the device software. The SI3215-KT supports software-configurable internal ringing up to 90 VPK. The ringing capability accommodates 5 REN at 4 kft and 3 REN at 8 kft, providing flexibility across different line lengths and network loading conditions. It also includes DTMF generation, an integrated battery supply with dynamic voltage output, and an on-chip DC-DC converter that continuously minimizes power consumption during operation. The device provides the BORSCHT line-interface functions in programmable CMOS. Its telephone signaling capabilities include expanded support for Japan and China country requirements, making it suitable for regional line-card and voice-access equipment. The manufacturer datasheet also documents migration differences from the earlier Si3210, which is important when reusing software, hardware, or production test procedures. Typical uses include Voice-over-Packet adapters, digital loopback terminators, integrated access devices, analog telephone adapters, and subscriber-line access concentrators. A design can use the integrated codec path for digital voice transport while using the programmable SLIC functions to supervise the line, control DC feed, and generate ringing voltage without a separate line-interface processor. Layout is especially important because this device controls a high-voltage analog line interface alongside sensitive digital signaling. Follow the manufacturer datasheet for the 38-pin TSSOP footprint, decoupling placement, ground-return construction, and isolation boundaries. Keep switching and high-energy ringing pathways away from codec and clock traces to reduce susceptibility to noise and surge-induced disturbance. This page consolidates the SI3215-KT’s key line-card functions, sourcing guidance, application fit, and practical integration considerations. It also distinguishes verified device capabilities from specifications that require confirmation against the manufacturer datasheet, helping engineers plan a design before finalizing the PCB, firmware, and production test strategy.

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SI3215M-C-FMR - Single-Channel SLIC/Codec w/ MOSFET DC-DC | Skyworks
SI3215M-C-FMR

SI3215M-C-FMR - Single-Channel SLIC/Codec w/ MOSFET DC-DC | Skyworks

The Skyworks Solutions (formerly Silicon Labs) SI3215M-C-FMR is a single-channel ProSLIC programmable CMOS Subscriber Line Interface Circuit (SLIC) with integrated codec, ringing, and MOSFET-based DC-DC converter, packaged in a 38-pin QFN (5x7 mm). It operates from a 3.13 V to 5.25 V supply, draws 88 mA typical supply current, and dissipates up to 700 mW while performing all BORSCHT functions on a single twisted-pair line. An SLIC (Subscriber Line Interface Circuit) is a mixed-signal IC used in VoIP gateways, central-office line cards, and DSLAM/PON ONU platforms to interface between the digital PCM/ SPI bus of a host processor and the analog 2-wire subscriber line. The SLIC handles Battery feed, Over-voltage protection, Ringing, Supervision, Coding, Hybrid, and Test (BORSCHT). Modern single-chip ProSLICs integrate the codec, battery switcher, and ringing waveform generator, replacing dozens of discrete analog components that older designs required. SI3215M-C-FMR is part of the Si3215 family that integrates a MOSFET-driver DC-DC converter, eliminating the external BJT or inductor typically required for the line-side battery feed. Key features include software-programmable internal balanced ringing up to 90 VPK (5 REN to 4 kft, 3 REN to 8 kft), an integrated battery supply with dynamic voltage control, low-power standby, and on-hook transmission. The 'M' suffix denotes the MOSFET-output variant (Si3215 without the M uses an external BJT/inductor), and the polarity of DCFF vs DCDRV is the only circuit difference between the two versions. Host interface options include PCM, GCI, and SPI for flexible connection to most VoIP SoCs. Typical applications include VoIP residential gateways, integrated access devices (IADs), PON/GPON ONTs, cable eMTA, small-office PBX line cards, and industrial FXO/FXS adapters. The integrated MOSFET driver cuts BOM cost and board area versus BJT-based SLICs. When designing with SI3215M-C-FMR, ensure the DC-DC converter's MOSFET and catch diode meet the peak ringing/battery-feed current demand; verify thermal dissipation on the QFN exposed pad and follow Skyworks reference layout for EMI/ESD compliance. This page synthesizes distributor pricing from 8+ sources, drop-in pin-compatible Si3215 family alternatives, and practical design notes not found on the manufacturer datasheet.

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SI3216-BT - 38-TSSOP Voice SLIC/CODEC | Silicon Labs
SI3216-BT

SI3216-BT - 38-TSSOP Voice SLIC/CODEC | Silicon Labs

Silicon Labs SI3216-BT is a single-channel ProSLIC analog telephone interface with GCI, PCM, and SPI interfaces, a 3.13 V to 5.25 V supply range, and a 38-pin TSSOP package. It supports wideband audio from 50 Hz to 7.0 kHz and narrowband audio from 200 Hz to 3.4 kHz, including 16-bit voice processing at a 16 kHz sampling rate. A SLIC, or subscriber line interface circuit, is the analog front end used to connect a telephone line to a digital voice system. It belongs to the codec and telephone-interface hierarchy within integrated interface ICs. By combining line-interface circuitry with voice encoding functions, the SI3216-BT is designed for Voice-over-IP gateways, analog terminal adapters, voice gateways, and other equipment that connects a copper-wire telephone line to a digital voice processor. The SI3216-BT combines a 1-channel SLIC/CODEC architecture with support for both wideband and narrowband operating modes. Its stated supply current is 88 mA, its rated power dissipation is 700 mW, and its operating temperature range is -40°C to +85°C. GCI, PCM, and SPI interfaces give system designers several paths for connecting the device to line-processing and control electronics. The industrial-temperature grade suits equipment expected to operate across extended commercial temperature environments. Technical operation depends on a low-voltage CMOS implementation operating from 3.13 V to 5.25 V. Wideband mode covers 50 Hz to 7.0 kHz for enhanced-voice systems, while narrowband mode covers 200 Hz to 3.4 kHz for conventional telephony. The 16-bit, 16 kHz codec capability supports digital voice processing with a 50% sampling margin relative to an 8 kHz narrowband voice channel, while wideband speech remains compatible with the specified 7.0 kHz audio bandwidth. Typical applications include VoIP analog terminal adapters, digital subscriber line equipment, voice-over-PBX gateways, voice-over-cable terminal adapters, and embedded analog telephone interfaces. Its principal design value is integrating the subscriber-line interface and codec into one device, reducing the number of separate analog and digital interface blocks required in a voice terminal. Layout and power-supply design remain critical in a high-gain telephone interface. Place bypass and decoupling capacitance close to the supply pins, keep sensitive analog routing away from digital switching signals, and follow the manufacturer’s reference-layout guidance. Verify line-side protection, grounding, and maximum operating voltages against the requirements of the target telephone network before releasing production hardware. This product record combines electrical specifications, interface details, application guidance, and a verified same-family alternative comparison. It is intended to help engineers confirm electrical, packaging, lifecycle, and design requirements before integrating the SI3216-BT into a telephone-interface design.

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SI3216-FT 1-Channel SLIC Codec, 38-TSSOP | Silicon Labs
SI3216-FT

SI3216-FT 1-Channel SLIC Codec, 38-TSSOP | Silicon Labs

The Silicon Labs SI3216-FT is a single-channel Subscriber Line Interface Concept and codec integrated circuit with GCI, PCM, and SPI interfaces, supplied in a 38-pin TSSOP package. Its operating supply range is 3.13 V to 5.25 V, with an 88 mA supply current and a listed power dissipation of 700 mW. The device supports dual-mode wideband and narrowband voice operation, including wideband audio to 7 kHz and narrowband audio to 3.4 kHz. An SLIC is an analog telephone-line interface that provides the bridge between a conventional subscriber line and digital switching equipment. The integrated codec portion converts voice signals into digital PCM data, while the SLIC circuitry handles line-facing functions. The SI3216-FT belongs to the interface IC category, where signal conditioning, line-interface control, and voice encoding must operate together within strict supply and board-space constraints. The principal features include one SLIC channel, 16-bit voice sampling at 16 kHz, and support for GCI, PCM, and SPI control paths. These interfaces provide options for connecting the device to digital switching, channel-bank, or host-control circuitry. The 3.13 V minimum operating voltage permits integration with systems operating below the traditional 5 V supply level, while the 5.25 V maximum supports legacy 5 V infrastructure. The SI3216-FT combines narrowband and wideband voice support in one device. Narrowband operation reaches 3.4 kHz, while wideband operation extends to 7 kHz, allowing the same design framework to support conventional voice and higher-fidelity speech. The 38-TSSOP package provides a surface-mount form factor for compact telecommunications equipment, although its relatively long body requires careful PCB layout and adequate pin clearance. Typical uses include voice-over-IP terminals, subscriber-line access equipment, digital loop carriers, voice gateways, and fixed-line analog adapters. In these systems, the codec generates digital voice samples while the SLIC interface connects to an analog telephone line. The supported 16-bit, 16 kHz format can also simplify synchronization with compatible PCM processing paths. Designers should account for the 700 mW listed power dissipation and provide stable, low-noise supply rails around the 3.13 V to 5.25 V operating range. Place decoupling capacitors close to the supply pins and maintain the recommended layout around analog, digital, and line-interface circuitry. Confirm external line-network components, protection requirements, clocking, and interface levels against the manufacturer datasheet before production release. This page combines the core electrical specifications, interface choices, application guidance, and verified same-footprint alternatives for the SI3216-FT. It also highlights the distinction between electrically similar options so that replacement decisions can be based on package compatibility, supply operation, temperature grade, interface behavior, and documented performance rather than part-number similarity alone.

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SI3216-GT - Wideband ProSLIC Codec 38-TSSOP | Silicon Labs
SI3216-GT

SI3216-GT - Wideband ProSLIC Codec 38-TSSOP | Silicon Labs

The Silicon Labs SI3216-GT is a low-voltage CMOS ProSLIC analog telephone interface and audio codec with one subscriber line channel, 3.13 V to 5.25 V supply operation, and a 38-pin TSSOP package. It supports wideband and narrowband telephony audio through GCI, PCM, and SPI interfaces while providing 16-bit audio sampling at 16 kHz for enhanced voice quality. A ProSLIC, or Subscriber Line Interface Circuit, is an integrated analog telephone interface that connects a voice codec to a customer-premises line. The Si3216 combines line-interface and codec functions within a voice-over-IP access device, placing it in the hierarchy of telecom interface ICs, telephone-line interface circuits, codecs, and system semiconductors. Its wideband mode supports audio from 50 Hz to 7 kHz, while narrowband mode covers 200 Hz to 3.4 kHz. Key features include dual-mode audio operation, a 16-bit codec operating at a 16 kHz sample rate, and support for GCI, PCM, and SPI interfaces. The stated supply current is 88 mA, the listed power dissipation is 700 mW, and the documented operating-temperature range is -40°C to 85°C. These characteristics suit compact CPE designs requiring one analog line endpoint and digital voice transport. The Si3216 is designed for Voice-over-IP terminals, voice gateways, access equipment, and other CPE products that benefit from wider speech bandwidth than traditional 3.4 kHz telephony. Its digital interfaces allow the codec section to connect to a system controller or digital signal processor, while its analog telephone interface handles the subscriber line. The multiple interface options also support designs that use either serial packet audio or parallel PCM signaling. Designers should provide suitable line-interface protection and separation circuitry around the analog telephone section and verify the external network requirements of the target CPE design. Decoupling should follow the manufacturer datasheet recommendations, with short, low-inductance supply connections helping limit susceptibility to switching noise on digital and analog rails. This page organizes the key SI3216-GT operating limits, interface capabilities, application fit, and verified drop-in candidates. It also provides practical sourcing, package, thermal, and design guidance for engineers evaluating the part in legacy or ongoing voice-access hardware. Alternative sourcing, lifecycle confirmation, and current lead-time requests can be handled through the Request a Quote form on this page, while the manufacturer datasheet remains the controlling reference for pin connections and application implementation.

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SI3216-KT 38-TSSOP Wideband SLIC Codec | Silicon Labs
SI3216-KT

SI3216-KT 38-TSSOP Wideband SLIC Codec | Silicon Labs

Silicon Labs SI3216-KT is a low-voltage CMOS ProSLIC integrated telephone interface and audio codec designed for Voice-over-IP equipment. The single-channel device supports wideband audio from 50 Hz to 7.0 kHz and narrowband audio from 200 Hz to 3.4 kHz, with 16-bit operation and 16 kHz sampling for wideband voice. It is packaged in a 38-pin TSSOP and operates from 3.13 V to 5.25 V. A Subscriber Line Interface Concept, or SLIC, is a semiconductor category that combines analog telephone-line interface functions with digital codec processing. In the power-management and communications hierarchy, the SI3216-KT belongs to the SLIC and codec class within interface ICs. Its purpose is to bridge a conventional analog telephone line and a digital voice-processing system, allowing a VoIP endpoint to support voice-band or wideband conversations while the host handles packetization and call control. The SI3216-KT combines wideband and narrowband codec modes in one device. The wideband path covers 50 Hz to 7.0 kHz, while the narrowband path covers 200 Hz to 3.4 kHz. According to the Silicon Labs Si3216 datasheet, it is a low-voltage CMOS device intended for enhanced-voice VoIP applications. Its listed operating supply range of 3.13 V to 5.25 V supports both 3.3 V and 5 V system rails, subject to the detailed limits and tolerances stated by the manufacturer. The component includes GCI, PCM, and SPI interfaces, giving a system designer several ways to connect the codec to external controller or line-interface circuitry. The verified specifications identify one codec circuit, 88 mA supply current, 700 mW power, a 0°C to 70°C operating range, and a 60 dB signal parameter in a 38-pin TSSOP package. Exact timing, line-driver current, gain distribution, hook-state thresholds, and absolute maximum limits must be taken from the manufacturer datasheet before final circuit design. Typical uses include VoIP analog telephone adapters, voice terminals, residential gateways, digital phone systems, and embedded voice processors. The wideband mode is useful when the network and signal chain can support a 16 kHz sampling rate, while narrowband mode preserves compatibility with conventional 200 Hz to 3.4 kHz telephony speech. The same-package SI3216M-KT and SI3216-FT are relevant cross-reference candidates for procurement and board-level planning, subject to suffix-specific qualification checks. The primary design consideration is the telephone line interface around the IC. A production design must follow the manufacturer’s recommended external network, protection, filtering, and component-selection circuits rather than treating the SI3216-KT as a standalone codec. PCB placement should minimize analog and digital coupling, provide appropriate ground-plane continuity, and place required bypass and interface components close to their associated pins. This product page consolidates the device’s electrical limits, package identity, operating modes, searchable specifications, comparison candidates, and application guidance. It also distinguishes verified SI3216-KT attributes from parameters that still require direct consultation of the manufacturer datasheet, helping engineers move from component identification to qualified design review without relying on generic SLIC assumptions.

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SI32171-C-GM1 - 1-Channel FXS ProSLIC, 42-QFN | Skyworks
SI32171-C-GM1

SI32171-C-GM1 - 1-Channel FXS ProSLIC, 42-QFN | Skyworks

The Skyworks SI32171-C-GM1 is a single-channel ProSLIC (Subscriber Line Interface Concept) device in a 42-pin QFN (5x7 mm) package that delivers a complete foreign-exchange-station (FXS) telephony interface with integrated DC-DC controller, low-power ringing, and PCM/SPI host interface. It is rated for -110 V ringing operation, integrates DTMF detection, and supports both 3.3 V and 1.8 V I/O from a 3.3 V supply. A ProSLIC (Subscriber Line Interface Concept) is a highly integrated mixed-signal IC that replaces dozens of discrete components traditionally needed to interface a digital system-on-chip to the analog two-wire telephone subscriber line. In the system hierarchy, the ProSLIC sits between the host SoC (or DSP) and the tip/ring pair, performing the BORSCHT functions (Battery feed, Over-voltage protection, Ringing, Supervision, Coding, Hybrid, and Testing). As an FXS device, it provides the central office side of the analog subscriber loop and is fundamental to VoIP gateways, integrated access devices, and fixed-line terminal adapters. Key features include a complete single-channel FXS solution, automatic battery voltage generation via the integrated DC-DC controller, internal balanced or unbalanced ringing with patented low-power ringing, global programmability for LSSGR/ITU/ETSI line standards, simplified configuration/diagnostics, and DTMF detect on-chip. The 5x7 mm footprint and reduced BOM significantly shrink the PCB area versus discrete line-interface designs. Technically, the Si3217x family uses CMOS mixed-signal design with on-chip high-voltage charge-pump drivers, an integrated DC-DC switching controller that derives optimal battery voltages per line state, and a Sigma-Delta codec pair for the transmit/receive paths. The automatic battery-voltage tracking dynamically minimizes power dissipation in on-hook, off-hook, and ring states, while the low-power ringing architecture avoids the bulky external ring relay in many designs. Typical applications include VoIP residential gateways, xDSL integrated access devices (IADs), cable telephony eMTA, fiber-to-the-home (ONT/ONU) voice ports, fixed wireless terminals, and small-office/home-office analog terminal adapters (ATAs). It is also used in industrial remote-metering and alarm panels where a single analog FXS port is required. When designing with this part, attention must be paid to the DC-DC inductor selection, line-side protection component choice (over-voltage, surge, PTC), and PCB creepage/clearance between the high-voltage traces and the low-voltage digital interface. The exposed thermal pad must be soldered to a sufficient ground pour for heat dissipation during sustained off-hook or ring states. This page synthesizes distributor pricing, drop-in family variants, and practical design notes not found in the manufacturer datasheet alone, enabling faster BOM selection and supply-chain risk assessment for ProSLIC-based FXS designs.

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SI3220-BQ Dual ProSLIC 3.3V/5V 64-TQFP | Silicon Labs
SI3220-BQ

SI3220-BQ Dual ProSLIC 3.3V/5V 64-TQFP | Silicon Labs

Silicon Labs SI3220-BQ is a dual-channel ProSLIC integrated circuit combining SLIC and codec functions in a 64-pin TQFP package. It operates from a single 3.3 V or 5 V supply, supports PCM, SPI, and GCI digital interfaces, and provides two analog telephone-line channels with integrated balanced ringing to 65 Vrms. The device consumes 65 mA and is specified for operation from -40 °C to +85 °C. A ProSLIC is a programmable subscriber-line interface circuit that consolidates multiple functions of a traditional analog telephone linecard. The SI3220 combines the SLIC, codec, and digital interface sections into one low-voltage CMOS device, while the companion Si3200 linefeed interface performs the external high-voltage functions. This division keeps high-voltage isolation and protection circuitry separate from the low-voltage signal-processing section. Key features include dual-channel operation, all BORSCHT functions, internal balanced ringing to 65 Vrms, low standby consumption, and support for applications up to 18 kft. The programmable digital interface can use standard PCM, SPI, or GCI connections, allowing the device to fit voice gateways, linecards, voice-over-packet systems, and digital PBX platforms. The 3.3 V and 5 V supply options provide flexibility across different linecard architectures. Internally, the SI3220 handles the low-voltage codec, line-driver, and digital control functions required by a dual analog channel. PCM or SPI connectivity carries voice and control traffic between the ProSLIC and host equipment, while GCI provides an alternative digital interface format. The companion Si3200 supplies the high-voltage linefeed path, including the external components needed to support ringing and telephone-line operation. Typical uses include two-channel analog telephone interfaces, broadband voice gateways, PBX linecards, Voice over Ethernet endpoints, digital loopback systems, and embedded voice adapters. For a new two-channel design, the SI3220-BQ is most suitable when the board architecture separates low-voltage codec and SLIC processing from high-voltage linefeed circuitry through Si3200 or Si3202 devices. The primary design consideration is the division between low-voltage and high-voltage sections. Maintain the isolation and creepage requirements of the telephone-line interface, place protection components near the line connectors, and validate the complete linecard against the applicable linefeed network and ringing requirements rather than relying on the SI3220 alone. This product data connects the SI3220-BQ specifications with compatible companion silicon, interface requirements, and design considerations, helping engineers identify the correct roles for the ProSLIC, linefeed interface, digital host interface, and external protection network.

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SI3220-FQ - Dual-Channel SLIC/CODEC, 64-TQFP | Skyworks Solutions
SI3220-FQ

SI3220-FQ - Dual-Channel SLIC/CODEC, 64-TQFP | Skyworks Solutions

The Skyworks Solutions SI3220-FQ is a dual-channel Subscriber Line Interface Concept and codec integrated circuit with GCI, PCM, and SPI interfaces, a 64-pin TQFP package measuring 10 mm by 10 mm, 3.3 V or 5 V operation, and a typical 65 mA supply current. It integrates two analog telephone-line channels with codec functionality for subscriber line access equipment. A SLIC is a semiconductor interface between a public switched telephone network line and a digital voice system, while a codec converts analog voice signals into digital PCM data. Integrating both functions into one IC reduces component count and simplifies dual-channel telephone interface designs. The SI3220-FQ supports GCI, PCM, and SPI control and data interfaces, allowing it to connect with a line-processing controller, DSP, or system processor. The SI3220-FQ performs the complete BORSCHT line-interface functions and supports applications operating with line lengths up to 18 kft. Its internal balanced ringing generator provides up to 65 Vrms, allowing the device to implement ringing on both channels without a separate balanced ringer circuit. These integrated functions reduce board area while retaining the line supervision, codec, and ringing capabilities required by analog telephone equipment. The device operates from either 3.3 V or 5 V and has a listed maximum power dissipation of 941 mW. Its specified operating-temperature range is 0°C to 70°C, making it appropriate for commercial-temperature subscriber line access, voice-over-IP endpoint, digital loop carrier, and analog telephone interface applications where environmental conditions remain within that range. Typical deployments include two-channel voice gateways, office telephone interfaces, central-office line cards, voice-over-IP adapters, and digital loop carrier equipment. The dual-channel architecture provides two analog line interfaces in one package, while the 64-TQFP construction simplifies assembly through standard surface-mount handling. Designers should follow the manufacturer pin-description table when assigning PCB tracks and should provide suitable bypass capacitors at the supply pins. Because the internal ringer can reach 65 Vrms, creepage, isolation, component spacing, and protection-network design require careful review. Confirm that the 0°C to 70°C temperature range, 941 mW power rating, and 18 kft application limit satisfy the intended deployment. This page combines the SI3220-FQ interface, channel-count, power, ringing, temperature, and package specifications with application guidance and a same-package selection analysis. It also distinguishes verified attributes from parameters that require confirmation in the manufacturer datasheet or design qualification process.

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SI3220-GQ - Dual SLIC/CODEC 64-TQFP | Skyworks Solutions
SI3220-GQ

SI3220-GQ - Dual SLIC/CODEC 64-TQFP | Skyworks Solutions

The Skyworks Solutions Inc. SI3220-GQ is a dual-channel Subscriber Line Interface Concept and codec integrated circuit with 3.3 V and 5 V supply operation, 65 mA supply current, and a 64-TQFP package measuring 10 mm by 10 mm. It combines two analog telephone-line channels, voice codecs, line diagnostics, and internal balanced ringing up to 65 Vrms in one device. A Subscriber Line Interface Concept, or SLIC, is the analog front end of a telephone line. It replaces discrete circuits for line sensing, ring detection, codec control, voice conversion, and subscriber-line supervision. The SI3220-GQ combines SLIC and codec functions, placing two complete channel interfaces within the wider category of telecom interface ICs, communication semiconductors, and integrated voice-access systems. The device performs the BORSCHT functions required for analog telephone-line operation: battery feed, overvoltage protection, ring supervision, codec signaling, hybrid control, and test access. Its internal balanced ringing reaches 65 Vrms, removing the need for a separate external balanced-ringer circuit in supported designs. Internal diagnostics provide line-condition information that can simplify fault detection and subscriber-line testing. The SI3220-GQ accepts GCI, PCM, and SPI interfaces, allowing it to connect with a digital communications processor or other voice-processing controller. These digital interfaces place the device between the analog subscriber line and the system’s PCM processing fabric. Its low-voltage CMOS implementation supports both 3.3 V and 5 V environments, while low standby power is important in continuously connected voice-access equipment. Typical uses include two-channel voice cards, digital PBX line cards, Voice over IP terminal adapters, analog telephone interfaces, central-office equipment, and other subscriber-line access systems. It is particularly suitable when both phone lines and voice-codec functions must fit into a compact 10 mm by 10 mm package without separate ringing generation. Designers should preserve adequate line-driver and ringing margins, follow the manufacturer’s external component and layout guidance, and validate the complete telephone interface against the intended application. The 941 mW listed power value and 65 mA supply current require attention to supply routing, thermal performance, and bypass-capacitor placement during multi-channel board design. This product data combines the SI3220-GQ’s channel configuration, interface types, power characteristics, ringing capability, package details, and verified ordering alternatives with engineering guidance for telecom line-card implementation. It also distinguishes confirmed package-compatible options from replacements that would require functional and board-level requalification.

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SI3220-KQ - Dual-Channel SLIC/Codec | Skyworks Solutions
SI3220-KQ

SI3220-KQ - Dual-Channel SLIC/Codec | Skyworks Solutions

Skyworks Solutions Inc. SI3220-KQ is a dual-channel Subscriber Line Interface Concept and codec integrated circuit with GCI, PCM, and SPI interfaces, a 65 mA supply current rating, and a 64-pin TQFP package measuring 10 mm by 10 mm. It combines two analog telephone-line channels with codec functionality and supports 3.3 V and 5 V supply operation. The device also provides internal balanced ringing up to 65 Vrms and internal diagnostics. A SLIC is the analog front end used to connect a subscriber telephone line to a digital communications system. By integrating the SLIC, codec, line-driver circuitry, ringing generation, and diagnostics, the SI3220-KQ reduces the component count required for dual-channel analog telephone equipment. In the component hierarchy, it is a telecom interface IC, a line-management IC, and a programmable CMOS SLIC/codec. The device performs the BORSCHT line functions and is identified for applications supporting lines up to 18 kft. Its interfaces support GCI, PCM, and SPI connectivity, allowing it to operate within digital line-card or voice-processing architectures. The internal balanced ringer reaches 65 Vrms, while internal diagnostics support board-level testing of the telephone interface. Its 65 mA supply-current rating and 941 mW listed power figure should be checked against the final rail topology and operating loads. The SI3220/Si3225 family uses programmable low-voltage CMOS circuitry to combine subscriber-line interface and codec functions in accordance with LSSGR, ITU, and ETSI specifications. This integration can simplify the voice path, reduce external glue logic, and shorten development time for dual-channel analog telephone adapters, voice-over-IP terminal equipment, and embedded voice gateways. Typical uses include dual-channel voice gateways, analog telephone line adapters, digital PBX line cards, embedded voice servers, and telecom access equipment. The SI3220-KQ is particularly relevant when one board must support two subscriber lines and when internal ringing and diagnostics can reduce external circuitry. Design carefully around the 64-pin TQFP footprint, exposed analog supply connections, line-interface protection, and the high-voltage ringing path. Use the manufacturer reference design and datasheet application circuit for component values and layout because line-interface networks and protection arrangements are tightly coupled to PCB routing and creepage requirements. This product record combines the part-specific electrical data, package information, interface options, application guidance, and engineering trade-offs needed to evaluate the SI3220-KQ for a dual-channel analog telephone design.

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SI3225-BQ Dual-Channel SLIC/CODEC | Silicon Laboratories
SI3225-BQ

SI3225-BQ Dual-Channel SLIC/CODEC | Silicon Laboratories

The Silicon Laboratories SI3225-BQ is a dual-channel, low-voltage CMOS Subscriber Line Interface Circuit and codec integrated into one 64-pin TQFP device. It supports 3.3 V and 5 V supply operation, has two analog telephone channels, and uses PCM, SPI, and GCI interfaces. The SI3225-BQ provides a complete dual-channel analog telephone interface for connected voice systems and is associated with LSSGR, ITU, and ETSI telephone-interface requirements. A SLIC is the analog front end of a voice subscriber line, while a CODEC converts between analog voice signals and digital PCM data. The SI3225 family combines these functions into a single CMOS IC, reducing the number of discrete telephone-interface components required by a central office, voice gateway, line card, or access-equipment design. Its dual-channel architecture allows one physical device to service two subscriber lines while sharing control, clock, and power circuitry. The SI3225-BQ supports both 3.3 V and 5 V supply configurations and has a listed maximum supply current of 65 mA. Its operating temperature range is -40°C to 85°C, with a listed maximum power dissipation of 941 mW. These ratings make the device appropriate for industrial and communications equipment that must operate from a controlled 3.3 V or 5 V system rail. The 64-pin TQFP package also provides a standardized surface-mount format for high-density line-card designs. Programmable CMOS integration gives the device a defined role in a telephone-line interface rather than a general-purpose signal path. The SI3225 family performs the BORSCHT line functions, supports external bulk ringer operation, and is intended for line lengths up to 18 kft. Its integrated SLIC and codec architecture simplifies the relationship between the physical analog line and the host PCM or GCI data interface, while internal control supports predictable telephone-network behavior. Typical applications include two-channel analog telephone line cards, voice-over-IP access equipment, central-office line interfaces, digital loopback and line-testing systems, and embedded voice gateways. In each design, the host processor must configure the device and exchange PCM traffic through a supported serial interface. The device is most suitable where two independent analog lines, digital voice conversion, and compact surface-mount integration are required in the same subsystem. Design attention should focus on the 3.3 V or 5 V supply implementation, analog telephone-line routing, external bulk-ringer support, and the host interface configuration. Keep sensitive analog and line-driver traces away from high-current switching paths, follow the package and reference-design layout guidance, and verify thermal performance against the 941 mW maximum rating under worst-case line activity. Firmware and line-card validation must also confirm BORSCHT and network requirements for the intended deployment. This product page combines the SI3225-BQ family specifications, interface and application context, verified source links, and engineering-focused design considerations. It also distinguishes temperature-ordering alternatives from functional replacements so procurement and design teams can assess compatibility without treating merely similar codecs as true drop-in devices.

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SI3225-FQ Dual-Channel SLIC/Codec IC | Silicon Labs
SI3225-FQ

SI3225-FQ Dual-Channel SLIC/Codec IC | Silicon Labs

The Silicon Labs SI3225-FQ is a dual-channel, low-voltage CMOS SLIC/codec integrated circuit for analog telephone-line interfaces, integrating the Subscriber Line Interface Circuit and codec functions in one 64-lead TQFP package. It provides two telephone channels, external ringing support, and internal diagnostics for communications equipment. A SLIC/codec, also called a ProSLIC, combines the line-driving and voice-processing functions required at the network edge. Within the product hierarchy, a SLIC/codec is a telecommunications interface IC, a mixed-signal semiconductor, and a system-level interface between a voice codec and the analog telephone line. The integrated architecture reduces the number of separate analog components while centralizing line supervision, voice processing, and diagnostic functions. The SI3225-FQ supports two independent analog channels in a single device, making it suitable for dual-channel line cards, voice gateways, embedded telephony systems, and customer-premises equipment. Its internal diagnostics assist development and troubleshooting, while external ringing support extends the available line-function capabilities without requiring the same external support arrangement for every design. The SI3225 series is described as a low-voltage CMOS dual ProSLIC platform designed for complete dual-channel analog telephone interfaces. The SI3225 family is associated with LSSGR, ITU, and ETSI interface requirements. Because line-card designs remain sensitive to codec behavior, ringing voltage, impedance, and channel configuration, engineers should preserve the silicon revision, device variant, and firmware configuration associated with the original qualified design. Typical deployments include two-channel analog adapters, voice-over-IP terminal equipment, digital transport cards, and legacy telephone interface equipment being modernized around an existing analog line. Two integrated channels can also reduce routing density and component count when the board must terminate two analog lines in a constrained area, although the line interface still requires the appropriate protection, isolation, and network-side components specified by the system design. During design review, check the SI3225 pin-description table in the manufacturer datasheet before assigning PCB tracks, and validate the external ringing network against the selected line-country configuration. Use the same variant and software configuration for production units, because changing ringing, impedance, or codec behavior may require renewed line-interface qualification even when the package and board footprint remain unchanged.

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SI3225-KQ - Dual-Channel SLIC/Codec TQFP-64 | Silicon Laboratories
SI3225-KQ

SI3225-KQ - Dual-Channel SLIC/Codec TQFP-64 | Silicon Laboratories

The Silicon Laboratories SI3225-KQ is a dual-channel SLIC/codec telecom line interface IC operating from a 3.3 V or 5 V supply, with an external bulk-ringer support feature and internal diagnostics. It is packaged in a 64-pin thin quad flat package (TQFP) and implements the high-voltage line functions required by analog telephone interfaces. The device contains two line circuits and supports GCI, PCM, and SPI interfaces according to its published specifications. A SLIC/codec is an integrated analog telephone line interface that combines the subscriber-line termination and codec functions required between a telephone network and digital voice equipment. In the hierarchy, a SLIC/codec belongs to the broader category of telecom interface ICs, combines analog line-interface and codec functions in one semiconductor, and serves as the bridge between external telephone-line circuitry and a digital voice system. The SI3225 family is specifically positioned for dual-channel analog telephone interfaces. Key characteristics include two line circuits, a 65 mA supply current rating, operation from either 3.3 V or 5 V, and a 941 mW power rating. The SI3225 supports external bulk-ringer circuitry, while the related Si3200 series also addresses ringing functions. According to the family documentation, the Si3200 linefeed interface family performs all high-voltage functions and can operate from 3.3 V, 5 V, single-battery, or dual-battery supplies, depending on the device and external circuit configuration. The SI3225 integrates both SLIC and codec functionality into a single IC. Its published interface options include GCI, PCM, and SPI, providing selectable pathways for connecting the device to a voice-processing system. The two-circuit architecture supports dual-channel line-card designs while reducing the number of separate analog-interface devices required. Internal diagnostics add observability for system troubleshooting, and the external bulk-ringer support broadens the available linepower design options. Typical uses include analog telephone adapters, voice-over-IP line interfaces, customer-premises equipment, digital PBX line cards, voice gateways, and dual-channel VoIP terminal designs. It is particularly relevant where a compact two-line interface is required and external protection, transformers, ringing, and line-interface networks can be implemented around the IC. System design requires careful separation between low-voltage digital circuitry and telephone-line high-voltage functions. Review the manufacturer pin-description table and recommended external networks before assigning nets. The 0 °C to 70 °C operating range is suitable for commercial-temperature equipment, but it requires confirmation against the enclosure temperature and applicable system qualification requirements. This product record combines the verified electrical and package characteristics, interface options, functional family information, and application guidance for the SI3225-KQ. It also identifies the limits of current cross-reference results and distinguishes a genuine pin-compatible replacement from a merely similar telecom interface device.

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SI3230-KT - Programmable CMOS SLIC with Ringing | Skyworks
SI3230-KT

SI3230-KT - Programmable CMOS SLIC with Ringing | Skyworks

Skyworks Solutions Inc. SI3230-KT is a single-channel, programmable CMOS subscriber line interface circuit with integrated balanced ringing and battery-voltage generation. The device supports internal ringing up to 90 VPK, five REN operation at 4 kft, three REN operation at 8 kft, DTMF generation and decoding, and a software-programmable codec interface. It is intended for 3.13 V to 5.25 V telecommunications equipment and is offered in a surface-mount 38-pin package. A subscriber line interface circuit, or SLIC, is the analog line-side component of a voice-over-packet or legacy telephone system. It connects the telephone line to a digital voice processor, supervises the line state, generates dial and ring signals, and helps establish the DC line voltage required by conventional handsets. Within the communications hierarchy, the SI3230-KT is a ProSLIC integrated circuit that combines line-interface functions with programmable ringing and battery supply generation rather than relying on a large collection of discrete telephone-line components. The main advantages of the SI3230-KT are integration and configuration flexibility. Its software-programmable internal ringing generator supports balanced ring voltages as high as 90 VPK, while the integrated battery supply provides dynamic line-voltage generation. Software control also enables DTMF signaling and codec-interface adjustment, allowing one hardware design to support multiple ringing and line-state requirements. The codec interface integrates the SLIC with a companion digital voice processor without requiring a separate physical telephone line for every configuration. The SI3230-KT includes a BJT/inductor DC-DC converter for the battery supply, as described in the manufacturer documentation. This converter supports the elevated DC and ringing voltages required by analog subscriber lines. Because the converter, ringing generator, battery supply, and signaling logic share one integrated package, the design must account for both analog line quality and the switching energy associated with generating ring voltage. Component selection for the external inductor and energy-storage network should follow the reference configuration and required ringing cadence in the datasheet. Typical applications include Voice over IP endpoint designs, digital subscriber line equipment, analog terminal adapters, voice gateways, embedded telephony controllers, and centralized telephone line cards. The device is particularly suitable when a compact single-channel solution is needed for line supervision, hook detection, DTMF handling, ringing generation, and codec interfacing. In multichannel equipment, several SI3230-KT devices may be arranged around a common voice processor, subject to channel-to-channel isolation, thermal, and routing requirements. Designers should preserve the separation between the line-side and codec-side circuitry, use the recommended ringing and battery-supply external components, and route sensitive analog and high-voltage ring-node connections carefully. The 3.13 V to 5.25 V supply requirement and approximately 88 mA supply current must be accommodated by the host power supply. Because the package exposes high-voltage line functions, board cleanliness, insulation spacing, and protection strategy are as important as low-noise digital layout. This product page combines the principal line-interface capabilities, package constraints, sourcing guidance, and design considerations needed to evaluate the SI3230-KT. It also distinguishes documented device features from parameters that require confirmation against the latest manufacturer datasheet, helping engineers assess it for telecom and embedded voice applications without changing the PCB footprint during early design review.

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SI3232-BQ - Dual-Channel Programmable CMOS SLIC | Skyworks
SI3232-BQ

SI3232-BQ - Dual-Channel Programmable CMOS SLIC | Skyworks

Skyworks Solutions Inc. SI3232-BQ is a low-voltage CMOS subscriber line interface circuit, or SLIC, with a dual-channel architecture and fully software-programmable analog telephone-interface functions for customer premise equipment applications. The verified product information identifies the device as a 64-pin TQFP package, although electrical ratings, temperature limits, clock requirements, and detailed pin assignments were not included in the supplied records. A SLIC is an integrated telephone-interface circuit that belongs to the broader telecommunications interface IC category. It provides the analog line-facing functions required when equipment connects to a telephone network, while allowing switching, supervision, and line-state behavior to be managed by software. In a dual-channel implementation, two analog line interfaces can be controlled from one programmable device, reducing component count compared with separate single-channel solutions. The SI3232's defining verified feature is full software programmability. This allows a customer premise equipment designer to configure line behavior through associated control software instead of relying entirely on fixed hardware settings. Dual-channel integration is particularly useful where two telephone lines must be handled within a compact endpoint, gateway, voice terminal, or analog line-card assembly. The specific programmable functions, register map, and host interface are not present in the supplied snippets. As a low-voltage CMOS IC, the SI3232 combines its analog telephone interface and digital control functions on one monolithic device. CMOS construction is broadly used for low-power integrated circuits because it can support dense digital logic at comparatively low supply voltages, although an exact operating-voltage range cannot be asserted from the supplied data. The 64-TQFP package provides a substantial pin count for two channels, line-state sensing, control connections, analog interfaces, and power or ground assignments. Typical applications include analog telephone adapters, voice-over-IP gateways, customer premise equipment, small telephone line cards, and other dual-line endpoints that require programmable analog line interfacing. For these systems, integration can simplify board partitioning and provide coordinated control of both channels. Designers must still verify line impedance, DC feed characteristics, ring-voltage requirements, codec connections, protection strategy, and regional regulatory behavior against the complete manufacturer documentation. The principal design consideration is that a SLIC is a specialized line-facing device rather than a general-purpose amplifier or codec. Its analog inputs and outputs must be paired with appropriate protection, filtering, routing, and layout measures, while its digital control interface must match the host processor and firmware architecture. Board design should preserve the pin assignments, grounding strategy, and decoupling recommendations contained in the complete SI3232 documentation. This page consolidates the verified product identity, package information, source links, and application context for SI3232-BQ while clearly separating verified facts from unavailable electrical data. The referenced datasheet and product listings should be used to confirm the complete electrical limits, pinout, lifecycle status, current price, and availability before committing a production design.

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SI3232-FQ - Dual-Channel 3.3V ISDN SLIC | Silicon Labs
SI3232-FQ

SI3232-FQ - Dual-Channel 3.3V ISDN SLIC | Silicon Labs

Silicon Labs SI3232-FQ is a dual-channel, fully programmable CMOS Subscriber Line Interface Circuit (SLIC) with a 3.13 V to 3.47 V supply range, 28 mA operating current, and a 64-TQFP 10 mm × 10 mm package. The device integrates balanced ringing up to 65 Vrms and is designed for customer-premise equipment, including ISDN and analog telephone interfaces. Its low-voltage CMOS implementation supports two subscriber lines while limiting standby power to less than 65 mW per channel. A Subscriber Line Interface Circuit, or SLIC, is an integrated-circuit category within analog and telecom interface ICs. It connects a telephone line to a digital or voice-processing system, providing line supervision, DC feed, ring generation, caller-status signaling, and the analog termination required for voice-band operation. In the electronics hierarchy, the SI3232-FQ is a dual-channel SLIC, a telecom interface IC, and ultimately a semiconductor designed for customer-premise telephony equipment. Key features include two integrated analog channels, software-programmable operation, internal balanced ringing rated to 65 Vrms, and low standby consumption below 65 mW per channel. The 3.3 V supply operation is suitable for modern embedded voice systems, while the 28 mA operating current helps control total board-level consumption. Its 64-TQFP package provides a compact surface-mount footprint for CPE designs requiring two telephone interfaces. The SI3232-FQ uses a low-voltage CMOS architecture and combines line-interface functions that would otherwise require multiple discrete or integrated circuits. The -FQ ordering code identifies the lead-free 64-TQFP package associated with a 10 mm × 10 mm body. Because this is a high-voltage telephone-interface device, correct isolation, protection, component spacing, and board-layout practices remain essential even though its logic supply is only 3.3 V. Typical uses include ISDN terminal adapters, VoIP phones, voice gateways, customer-premise analog phone adapters, small-business telephone systems, and embedded telephony equipment. In each case, the two channels can serve separate subscriber lines while software control configures line behavior and monitoring functions. The device is particularly relevant where a compact, integrated SLIC is preferred over discrete line-driver circuitry. Designers should not assume that the 3.3 V logic supply is the only voltage present at the line pins. Balanced ringing can reach 65 Vrms, so external protection, insulation coordination, and creepage or clearance planning must satisfy the applicable telephone-interface requirements. Decoupling should be placed close to the supply pins, and the complete line network should be validated under off-hook, on-hook, surge, and ringing conditions. This product record combines verified distributor specifications, source-backed interface characteristics, and design guidance focused on the SI3232-FQ. It also distinguishes the confirmed SI3232-G-FQ cross-reference candidate from unverified alternatives, avoiding unsupported claims about pin-compatible parts while helping engineers evaluate the original dual-channel SLIC for legacy CPE, ISDN, and VoIP designs.

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SI3232-KQ - Dual-Channel Programmable SLIC | Silicon Labs
SI3232-KQ

SI3232-KQ - Dual-Channel Programmable SLIC | Silicon Labs

The Silicon Laboratories SI3232-KQ is a low-voltage CMOS subscriber line interface circuit (SLIC) providing two programmable analog telephone channels for customer premise equipment. It operates from a single 3.3 V supply, communicates through a standard SPI digital interface, and is offered in a 64-pin TQFP package. The SI3232 performs the programmable SLIC functions, while the external Si3200 linefeed interface IC performs the associated high-voltage functions. A SLIC is an integrated telephone-interface device that combines programmable analog voice-channel functions with digital control. It belongs to the interface IC hierarchy, connecting a voice codec or system controller to an analog telephone line. The SI3232-KQ targets CPE designs requiring two channels, centralized register configuration, and a compact low-voltage CMOS implementation. The device provides dual-channel SLIC functionality, a 3.3 V single-supply operating requirement, and a standard SPI control interface. These features make it suitable for voice gateways, digital subscriber line equipment, analog telephone adapters, and other multi-channel voice systems. Programmability allows the controller to configure channel behavior through the serial interface instead of requiring separate fixed-function logic for each line. Its architecture separates low-voltage channel processing from high-voltage linefeed functions. According to the supplied Silicon Laboratories datasheet, the SI3232 performs all programmable SLIC functions, whereas the Si3200 performs all high-voltage functions. This division limits high-voltage handling to the dedicated linefeed IC while allowing the SI3232-KQ to operate from 3.3 V CMOS supply rails. Typical applications include two-channel analog telephone interfaces, customer premise equipment, voice-over-packet gateways, and telecom access products that require software-controlled SLIC operation. A system implementation must also account for the external Si3200, external line protection, and the separation between low-voltage logic and high-voltage telephone-line functions. The principal design consideration is system partitioning. The SI3232-KQ should not be treated as a complete standalone line interface: it requires the Si3200 for high-voltage functions, suitable bypass components, careful SPI control, and application-specific protection. Verified pin-level connection and absolute timing limits should be checked against the manufacturer datasheet before layout release. This page consolidates the verified SI3232-KQ product facts, identifies the Si3200 companion device, and separates documented characteristics from parameters that require datasheet confirmation. It also highlights sourcing and replacement constraints that are not resolved by generic SLIC cross-reference results.

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SI4112-BM - 1 GHz IF Synthesizer | Silicon Labs
SI4112-BM

SI4112-BM - 1 GHz IF Synthesizer | Silicon Labs

Silicon Labs SI4112-BM is a 1 GHz frequency-synthesizer IC with an integrated VCO, supplied in a 28-pin MLP package with an exposed pad. It is intended for IF signal generation in wireless communications equipment and is listed as an obsolete EOL device. The verified distributor listing identifies one synthesizer circuit, surface mounting, a 5x5 mm package, and an operating range of -40°C to 85°C. The Si4112-D family performs IF and dual-band RF synthesis, reducing external passive components and eliminating external VCOs and varactor diodes according to the manufacturer product-page result. A frequency synthesizer is a clock-and-timing integrated circuit that generates a controlled output frequency from a reference source. The PLL and integrated VCO provide a compact way to produce stable intermediate-frequency signals in RF receivers, transmitters, and communication systems. In the product hierarchy, this part is a frequency-synthesizer IC, then a PLL/clock-and-timing IC, then a timing and RF synthesis building block within a wireless communication system. The verified listing gives the device's headline frequency capability as 1 GHz. Its 28-VFQFN exposed-pad package is intended for compact surface-mount designs and provides a defined thermal and electrical land pattern. Because the exposed pad is part of the package, the PCB footprint must include the manufacturer's recommended thermal-pad connection and layout. The listed operating temperature range is -40°C to 85°C. Other detailed electrical timing, phase-noise, current, supply-voltage, and tuning-range values were not included in the supplied data and must be confirmed from the manufacturer datasheet before design release. Typical applications include IF synthesis in wireless personal communications, RF receiver and transmitter signal chains, and other communication systems requiring a compact integrated synthesizer. The integrated VCO can reduce the external component count compared with a discrete VCO implementation, but it does not remove the need to validate loop stability, reference noise, tuning range, output drive, and layout performance. The principal design consideration is lifecycle risk: SI4112-BM is marked obsolete in the verified GlobalSpec result. For new production, evaluate an active replacement only after checking its frequency range, package, pinout, supply voltage, reference requirements, and RF performance. Treat distributor inventory as temporary and validate the specific lot before committing to a long-term design. This page consolidates the verified manufacturer and distributor information, explicit lifecycle status, package identity, and sourcing context. It also records missing datasheet parameters rather than inferring them, while the comparison and application notes help engineers distinguish an obsolete but documented device from an unverified substitute.

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SI4112-BT - 1 GHz Dual-Band RF Synthesizer | Silicon Labs
SI4112-BT

SI4112-BT - 1 GHz Dual-Band RF Synthesizer | Silicon Labs

The Silicon Labs SI4112-BT is a 1 GHz dual-band RF frequency-synthesizer IC with integrated VCOs for wireless communications, supplied in a 24-pin TSSOP package measuring 4.40 mm wide. Its headline characteristics are a 1 GHz maximum stated frequency, one RF output according to the verified distributor listing, and a 24-TSSOP surface-mount package. The SI4112-BT is intended for wireless communication systems requiring programmable high-frequency signal generation with integrated voltage-controlled oscillators. An RF synthesizer is a clock-and-timing semiconductor that generates a controlled output frequency from a reference source. In the broader hierarchy, this product is an RF frequency synthesizer, part of clock and timing ICs, and ultimately a semiconductor used to establish the carrier or local-oscillator signal in a wireless transmitter or receiver. Its integrated VCOs reduce the number of separate frequency-generation components needed in RF designs. The verified distributor information identifies the SI4112-BT as a frequency-synthesizer IC operating up to 1 GHz and packages it as 24-TSSOP, or 0.173-inch by 4.40 mm width. Search results also describe the device as a dual-band RF synthesizer with integrated VCOs for wireless communications. Detailed phase-noise, tuning-range, supply-voltage, output-power, temperature, and lock-time figures were not included in the supplied source data and should be confirmed from the manufacturer datasheet before design release. The SI4112-BT fits RF front ends, wireless transceivers, local-oscillator generation, modulation and demodulation chains, and communication equipment requiring a programmable RF reference. Integrated VCOs are particularly useful when board area and external frequency-generation complexity are priorities, although loop-filter, reference, and RF-layout requirements still need careful validation. For a new layout, preserve the 24-TSSOP footprint and verify every pin function against the applicable datasheet revision. Do not infer programming, charge-pump, reference, or supply connections from the family description alone; the supplied evidence confirms the device identity and broad frequency-synthesizer role, but not a complete electrical pin map. Validate RF trace impedance, keep the synthesizer reference path short, and test tuning and lock behavior across the intended channel plan.

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SI4112-D-GT - 1 GHz Dual-Band RF Synthesizer | Skyworks
SI4112-D-GT

SI4112-D-GT - 1 GHz Dual-Band RF Synthesizer | Skyworks

Skyworks SI4112-D-GT is a 1 GHz dual-band frequency-synthesizer IC with integrated VCOs, an IF output, and a 24-pin TSSOP package measuring 0.173 inch wide by 4.40 mm. The verified distributor listing identifies it as a PLL RF synthesizer for wireless communications, while the manufacturer describes it as a low-noise RF frequency-synthesis solution for price-sensitive, low-power personal wireless systems. A frequency synthesizer is a phase-locked-loop timing and RF component that locks a voltage-controlled oscillator to a stable reference frequency. The SI4112 family integrates the VCO circuitry and associated RF functions, reducing the need for external VCOs, varactor diodes, and passive networks. The manufacturer specifically identifies dual-band and IF synthesis as useful functions for wireless personal-communications equipment. The verified product data establishes a maximum listed frequency of 1 GHz and a single output channel. It also identifies a 24-TSSOP surface-mount package with a 0.173-inch body width and 4.40 mm overall width. Skyworks states that the integration can reduce external passive-component count, eliminate external VCOs and varactor diodes, and improve power efficiency compared with less-integrated implementations. This device belongs to the RF synthesizer hierarchy: RF frequency synthesizer → PLL → clock and timing IC → integrated circuit. Its integrated VCO architecture makes it relevant to compact wireless receivers and transmitters where board area, external component count, and power efficiency are important. The provided sources describe the part for wireless personal communications rather than high-end test equipment or precision instrumentation. Typical uses include RF down-conversion and up-conversion systems, wireless communication transceivers, and compact RF signal chains requiring programmable frequency generation. The IF output allows the synthesized signal to be used as an intermediate-frequency source in a receiver or transmitter architecture. The available verified data does not establish exact operating voltage, tuning range, phase-noise values, output power, temperature limits, or pin-level electrical limits. Designers should verify the complete manufacturer datasheet before layout or RF matching. The 24-pin TSSOP footprint requires careful high-frequency routing, controlled ground return paths, and decoupling close to the device pins. Because this is a frequency-sensitive RF component, component tolerances, reference-frequency stability, loop-filter implementation, and output matching can materially affect system performance. This page consolidates verified distributor identity, package information, manufacturer application context, pricing fields marked as data-needed, and replacement-search limitations for SI4112-D-GT. It does not invent undocumented electrical ratings or treat generic cross-reference search results as verified drop-in equivalents.

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SI4112-D-GTR - 1 GHz Dual-Band RF Synthesizer | Skyworks (Tape & Reel)
SI4112-D-GTR

SI4112-D-GTR - 1 GHz Dual-Band RF Synthesizer | Skyworks (Tape & Reel)

Skyworks SI4112-D-GTR is a 1 GHz dual-band frequency-synthesizer IC with integrated VCOs, an IF output, and a 24-pin TSSOP package measuring 0.173 inch wide by 4.40 mm. The verified distributor listing identifies it as a PLL RF synthesizer for wireless communications, while the manufacturer describes it as a low-noise RF frequency-synthesis solution for price-sensitive, low-power personal wireless systems. A frequency synthesizer is a phase-locked-loop timing and RF component that locks a voltage-controlled oscillator to a stable reference frequency. The SI4112 family integrates the VCO circuitry and associated RF functions, reducing the need for external VCOs, varactor diodes, and passive networks. The manufacturer specifically identifies dual-band and IF synthesis as useful functions for wireless personal-communications equipment. The verified product data establishes a maximum listed frequency of 1 GHz and a single output channel. It also identifies a 24-TSSOP surface-mount package with a 0.173-inch body width and 4.40 mm overall width. Skyworks states that the integration can reduce external passive-component count, eliminate external VCOs and varactor diodes, and improve power efficiency compared with less-integrated implementations. This device belongs to the RF synthesizer hierarchy: RF frequency synthesizer → PLL → clock and timing IC → integrated circuit. Its integrated VCO architecture makes it relevant to compact wireless receivers and transmitters where board area, external component count, and power efficiency are important. The provided sources describe the part for wireless personal communications rather than high-end test equipment or precision instrumentation. Typical uses include RF down-conversion and up-conversion systems, wireless communication transceivers, and compact RF signal chains requiring programmable frequency generation. The IF output allows the synthesized signal to be used as an intermediate-frequency source in a receiver or transmitter architecture. The available verified data does not establish exact operating voltage, tuning range, phase-noise values, output power, temperature limits, or pin-level electrical limits. Designers should verify the complete manufacturer datasheet before layout or RF matching. The 24-pin TSSOP footprint requires careful high-frequency routing, controlled ground return paths, and decoupling close to the device pins. Because this is a frequency-sensitive RF component, component tolerances, reference-frequency stability, loop-filter implementation, and output matching can materially affect system performance. This page consolidates verified distributor identity, package information, manufacturer application context, pricing fields marked as data-needed, and replacement-search limitations for SI4112-D-GTR. It does not invent undocumented electrical ratings or treat generic cross-reference search results as verified drop-in equivalents.

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SI4113-BT - 1.8 GHz Dual-Band RF Synthesizer | Silicon Labs
SI4113-BT

SI4113-BT - 1.8 GHz Dual-Band RF Synthesizer | Silicon Labs

The Silicon Labs SI4113-BT is a 1.8 GHz dual-band RF frequency-synthesizer IC with integrated VCOs and RF outputs, supplied in a 24-pin TSSOP package. It operates from a 2.7 V to 3.6 V supply, provides programmable power-down modes, and draws 18 mA typical supply current while offering 1 µA standby current. The verified listing identifies the device as a frequency synthesizer with a 1:1 input-to-output ratio. A frequency synthesizer is a phase-locked-loop building block that derives or generates stable RF carrier signals from a reference frequency. In the broader semiconductor hierarchy, a frequency synthesizer is a clock-and-timing IC, a PLL-based RF synthesizer, and ultimately a semiconductor used to control wireless transmitters and receivers. The SI4113-BT integrates VCOs, loop filters, and related RF synthesis functions to reduce the external-component count required for wireless communications designs. Key verified features include integrated VCOs and loop filters, operation at 3.6 V, a maximum operating temperature of +85 °C, and a 24-TSSOP package measuring 0.173 inches, or 4.40 mm, in width. The verified distributor description identifies the part as an RF synthesizer with RF1/RF2 outputs, while another source describes a dual-band architecture and harmonic suppression of -26 dBc. These features suit RF signal-chain designs where local frequency generation, channel selection, and compact implementation are important. The SI4113-BT is intended for wireless communications equipment using RF1 and RF2 synthesis paths. Its dual-band structure can support systems requiring more than one RF output or related modulation and frequency-generation functions. Because RF synthesizers are sensitive to loop stability, reference noise, supply variation, layout coupling, and unwanted harmonics, the power supply, reference path, decoupling network, and output transmission lines require careful PCB implementation. A primary design consideration is preserving the specified 2.7 V to 3.6 V supply range and providing clean decoupling close to the power pins. Designers should also verify the selected reference frequency, divider settings, loop-filter configuration, output frequency range, and RF trace impedance against the complete manufacturer datasheet before layout release. Use controlled-impedance routing and a compact RF return path to minimize unintended reflections and coupling. This page combines verified distributor specifications, sourcing information, available cross-reference results, and practical RF design guidance. It distinguishes confirmed SI4113-BT data from specifications that require datasheet confirmation, helping engineers evaluate the synthesizer before requesting procurement support.

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