Integrated Circuits

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Products (38,000+)

SI3211-KT - Single-Channel SLIC/Codec | Silicon Labs
SI3211-KT

SI3211-KT - Single-Channel SLIC/Codec | Silicon Labs

Silicon Labs SI3211-KT is a programmable CMOS subscriber line interface and codec (SLIC/codec) designed for one-channel telephone-line interface applications. It integrates a single-channel SLIC, codec, DTMF decoder, ringing-voltage generation, and battery-voltage generation functions in a 38-terminal gull-wing TSSOP package. The device operates from 5 V, making it suitable for telecommunications equipment requiring a dedicated integrated line-interface solution. A SLIC is the analog-facing portion of a telephone subscriber line interface. It handles the line conditions encountered by voice-band equipment and provides the interface between the central-office line and digital voice-processing circuitry. A codec converts analog voice signals into digital representations and reverses that process. The SI3211-KT combines these functions with ringing and battery-voltage generation to support compact, single-channel subscriber line interface designs. Programmability is the central feature of the SI3211-KT. Its CMOS interface circuitry allows system designers to configure line parameters rather than relying only on fixed external analog networks. The integrated DTMF decoder supports detection of dual-tone multifrequency signaling, while the ringing and battery-voltage generators support the DC and ringing conditions required by connected telephone equipment. Integration reduces the number of discrete functions required around the line interface. The SI3211-KT is identified as a commercial-temperature component and is supplied in a 38-pin TSSOP package with gull-wing leads and a rectangular package body. This package supports conventional surface-mount assembly and inspection, but the narrow lead pitch requires a careful PCB footprint and adequate clearance between adjacent routed conductors. A complete terminal map and recommended land pattern should be taken directly from the manufacturer datasheet and package drawing before layout release. Typical uses include single-channel voice-over-IP terminals, analog telephone adapters, embedded telephony gateways, customer-premise line equipment, and small-format telephone interface modules. In these systems, the device can consolidate line termination, voice conversion, DTMF recognition, and subscriber-line power functions. The exact external component network and firmware configuration remain application-specific and should follow the manufacturer reference design and application guidance. Power routing should provide a low-impedance 5 V rail and a quiet return path to the line-interface analog section. Keep sensitive routing away from switching nodes and high-current ringing paths, and place filtering and protection components near the line connector. PCB creepage, clearance, surge protection, and isolation requirements must be established from the applicable telephone-interface environment rather than inferred from the package dimensions. This page consolidates the available SI3211-KT product information into an engineering-focused package summary, application guidance, comparison framework, and design checklist. Because a verified pin-to-pin replacement was not identified, replacement decisions should begin with the Request a Quote form on this page and conclude with a full review of terminal assignments, line parameters, clocking, firmware, and protection requirements.

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SI3215-BT - Programmable SLIC/Codec | Silicon Labs
SI3215-BT

SI3215-BT - Programmable SLIC/Codec | Silicon Labs

The Silicon Labs SI3215-BT is a single-channel programmable CMOS Subscriber Line Interface Circuit and integrated codec with ringing and battery-voltage generation, packaged in a 38-pin TSSOP. It supports a 3.13 V to 5.25 V supply range, 41 mA operating current, 60 dB signal performance, and GCI, PCM, and SPI interfaces. Its software-configurable ringing generator supports up to 5 REN and 90 VPK. A SLIC is the analog-facing circuit that connects a telephone line to a digital voice system, while a codec converts between analog voice signals and digital PCM data. The SI3215-BT combines these functions into one programmable device, placing line termination, voice conversion, ringing generation, and battery feeding in a single telecom interface IC. Programmable internal balanced ringing is one of the device’s principal functions. The ringing engine can operate at 5 REN up to 4 kft or 3 REN up to 8 kft, with a maximum ringing voltage of 90 VPK. DTMF generation, BORSCHT line functions, and expanded support for Japan and China country requirements broaden its applicability to regional analog telephone systems. An integrated battery supply and dynamically controlled DC-DC converter produce the negative battery voltage required by the line interface. The converter continuously adjusts its operating point to minimize power consumption. According to the manufacturer datasheet, the SI3215 also performs all BORSCHT functions and supports software migration considerations from the earlier Si3210 family. Typical uses include single-line VoIP adapters, analog terminal adapters, embedded telephony gateways, voice-over-IP endpoint equipment, and legacy telephone interface designs that require PCM or GCI connectivity. The 38-pin TSSOP package is suitable for conventional surface-mount assembly where the system also requires high-voltage ringing and battery circuitry. Designers must account for the line-side high voltage, isolated ringing requirements, analog impedance matching, digital codec timing, and power-supply sequencing. The exact hook state, DC feed, ringer threshold, and country-specific parameters should be programmed and validated against the target line and network requirements before production release. This product page combines package, interface, ringing, supply, and application details with practical design considerations for engineers evaluating the SI3215-BT. It also identifies the limitations of cross-reference results so that a replacement is selected only when package, pinout, interface, and telephone-network behavior are confirmed together.

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SI3215-C-FM - ProSLIC SLIC/Codec with 90VPK Ringing | Skyworks
SI3215-C-FM

SI3215-C-FM - ProSLIC SLIC/Codec with 90VPK Ringing | Skyworks

The Skyworks SI3215-C-FM is a single-channel ProSLIC Subscriber Line Interface Concept (SLIC) and CODEC IC housed in a 38-pin QFN (5x7 mm) package, integrating software-configurable 5 REN internal ringing up to 90 VPK, DTMF generation, and a comprehensive set of telephony signaling capabilities with expanded support for Japan and China country requirements. It pairs with the Si3201 line-side DC-DC controller (in a thermally-enhanced 16-pin SOIC) to form a complete FXS interface solution. Supply voltage is 3.13V to 5.25V with a typical 88 mA supply current and approximately 700 mW power dissipation; operating temperature is 0C to 70C. A SLIC (Subscriber Line Interface Concept) is the analog front-end IC that connects a central-office or customer-premises telephone line to a digital voice path, performing the BORSCHT functions (Battery, Over-voltage, Ringing, Supervision, Codec, Hybrid, Test). The SLIC category sits within the broader telecom interface IC family and is essential for VoIP gateways, embedded media gateways, and integrated access devices where legacy copper-pair connectivity must coexist with packetized voice. Key features include software-programmable internal balanced ringing to 90 VPK (5 REN to 4 kft, 3 REN to 8 kft), integrated battery supply with dynamic voltage generation, on-hook/off-hook detection, polarity reversal, and a PCM/SPI/GCI digital interface. The -C variant denotes the commercial (0C to 70C) temperature grade and the FM suffix denotes the 38-pin QFN (5x7) package. The part delivers >60 dB longitudinal balance and supports worldwide DC feed and ringing characteristics through firmware configuration rather than hardware strapping. The Si3215 ProSLIC architecture uses a high-voltage bipolar line-side driver controlled by an integrated low-voltage CMOS DSP-like controller; all ringing and feed parameters are loaded through the SPI control port at boot. Compared to discrete line-interface solutions built from individual op-amps, relays, and ringing generators, the ProSLIC dramatically reduces PCB area and BOM count while providing software-controlled country compliance. Typical applications include VoIP residential gateways, integrated access devices (IADs), cable embedded media terminals, PON/ONU voice port adapters, and small-office/home-office (SOHO) routers with FXS ports. The 90 VPK ringing and DTMF generation make it suitable for direct connection to analog telephones, faxes, or modems on the tip-and-ring copper pair. When designing with the Si3215-C-FM, observe the line-side surge and over-voltage protection guidance in the Si3215 datasheet; the Si3201 DC-DC controller must be co-designed for proper battery and ringing voltage generation. Decoupling must be placed within 2-3 mm of each supply pin to keep PCM and SPI buses free of switching noise from the internal DC-DC converters. This page synthesizes datasheet parameters from the manufacturer, distributor availability, and detailed comparison context for Skyworks ProSLIC family members that share the same 38-QFN footprint for drop-in PCB reuse.

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SI3215-FM - ProSLIC Programmable CMOS SLIC/Codec, 5 REN, 90Vpk | Skyworks
SI3215-FM

SI3215-FM - ProSLIC Programmable CMOS SLIC/Codec, 5 REN, 90Vpk | Skyworks

The Skyworks (formerly Silicon Laboratories) SI3215-FM is a ProSLIC programmable CMOS Subscriber Line Interface Circuit (SLIC) with integrated codec and ringing/battery voltage generation, housed in a 38-pin QFN (5x7 mm) package. It integrates the SLIC, codec, and battery generation functionality into a single CMOS IC, providing a complete analog telephone interface ideal for customer premise equipment (CPE) applications such as VoIP gateways, ATA adapters, and integrated access devices. What is a SLIC/Codec? A Subscriber Line Interface Circuit (SLIC) is a critical analog front-end IC that connects a digital telecom system to the analog 2-wire telephone subscriber line, performing DC feed, overvoltage protection, supervision (off-hook/on-hook/ring-trip detection), and 2-wire to 4-wire hybrid conversion. The codec digitizes the voice band signal for DSP processing. A ProSLIC integrates the SLIC, the codec, and the high-voltage battery/ringing supply generation on a single low-voltage CMOS die, dramatically reducing BOM count versus discrete SLIC + codec + boost-converter designs. Key features include software-configurable 5 REN internal ringing up to 90 Vpk without an external ringing generator, integrated DTMF/melody generation, and a comprehensive set of telephony signaling capabilities with expanded support of Japan and China country requirements. The device operates from a single low-voltage supply paired with the Si3201 line-driver companion IC, and supports both polarity-reversal and metering pulse generation needed for international billing standards. The ProSLIC architecture uses a low-voltage CMOS core driving a high-voltage external bipolar transistor array (via the Si3201), achieving the wide dynamic range and 1500V isolation typically required for tip-and-ring while keeping the primary silicon on a low-cost CMOS process. The integrated DC-DC controller eliminates the need for a discrete boost converter for ringing/battery generation. Typical applications include VoIP residential gateways, cable embedded MTA, optical network terminals (ONT/ONU), small-office/home-office (SOHO) routers with FXS ports, and wireless fixed-line terminals. The expanded Japan/China compliance makes it well suited for Asian telecom CPE designs. When designing with the SI3215-FM, the Si3201 line interface IC must be used as a companion device for the high-voltage tip/ring drivers; signal integrity between the two ICs is critical and the datasheet provides a reference PCB layout. Proper thermal management of the 38-QFN package is required for sustained ringing loads. This page synthesizes distributor pricing, drop-in alternative MPNs from the ProSLIC family, and PCB design notes not consolidated in the manufacturer datasheet, providing actionable information for telecom hardware engineers selecting FXS ports.

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

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

The Silicon Labs SI3215-FT is a programmable CMOS subscriber line interface circuit and codec (ProSLIC) designed for customer-premise telecommunications equipment. It supports software-configurable internal ringing up to 90 VPK, operates with up to 5 REN at 4 kft, and supports up to 3 REN at 8 kft. The device is packaged in a 38-pin TSSOP and combines BORSCHT line functions, ringing and battery-voltage generation, voice codecs, and digital telephony signaling in one integrated circuit. A ProSLIC is a highly integrated telephone-interface IC used to connect a voice codec and digital line-control system to an analog subscriber line. Its programmable architecture replaces several discrete functions associated with BORSCHT line supervision, ring generation, battery feed, DTMF generation, and codec operation. This integration reduces external circuitry while allowing line behavior to be adjusted through device software rather than fixed external component networks. Key features include internal balanced ringing to 90 VPK, dynamically controlled battery voltage, DTMF generation, and software-programmable country-specific signaling. According to the manufacturer datasheet, the Si3215 family supports requirements associated with Japan and China. The integrated DC-DC converter controller continuously minimizes power by producing the battery voltage required for the current operating state from a single positive supply, reducing the need for a large external battery supply. The SI3215 is intended for single-channel CPE designs where analog telephone access must coexist with a digital voice processor. Its digital interfaces and programmable control allow the host system to manage line state, ring cadence, tone generation, and codec operations. A complete implementation must account for linefeed components, protection paths, ringing-network constraints, thermal margins, and host-specific register configuration. Typical applications include analog VoIP terminals, customer-premises telephony equipment, digital telephone adapters, voice-over-LAN endpoints, embedded telephony gateways, and legacy telephone-interface designs requiring programmable BORSCHT behavior. The 38-pin TSSOP package is also appropriate where a surface-mount single-channel solution is required but a higher pin-count QFN variant is not necessary. Designers should use the pin-description and typical application circuits in the manufacturer datasheet when assigning PCB nets and selecting the external line interface network. Validate ringing voltage, loop current, dc feed, thermal performance, and protection behavior in the final telephone equipment because these parameters depend on the line length, country-specific requirements, and external passive network. This page organizes the principal Si3215 capabilities into an application-focused guide, adds practical implementation considerations, and separates documented functions from parameters that must be confirmed in the complete manufacturer datasheet before a new board is released.

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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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