SI3201-BS - Programmable CMOS SLIC with Ringing | Skyworks
MPN: SI3201-BS ✓ ActiveSI3201-BS Overview
A subscriber line interface circuit is a mixed-signal telecommunications integrated circuit that connects a central-office or VoIP analog line to a digital voice system. In the component hierarchy, a SLIC is an interface IC, a telecommunications semiconductor, and a system-on-chip integration of line-driving, codec, ringing, and battery functions. This integration reduces the number of external components required in customer premises equipment while placing analog line control under software management.
The SI3201-BS combines a low-voltage CMOS implementation with a software-programmable SLIC and codec interface. Its internal balanced ringing generator supports 90 VPK output. The stated ringing capability includes five REN at 4 kft and three REN at 8 kft, allowing the ringing load to be evaluated for different loop lengths. The integrated battery supply provides dynamic voltage output for the line interface.
The device accepts a 3.13 V to 5.25 V supply range and can operate with PCM, serial, or SPI control interfaces. Reported operating supply current is 1 mA for the series, while another distributor result lists 88 mA for the SI3201-BS; these figures should be checked against the exact test conditions in the manufacturer datasheet before they are used in a power budget. Maximum power dissipation is reported as 800 mW, making thermal design and copper area relevant in space-constrained designs.
Typical uses include analog terminal adapters, cable telephony equipment, wireless local-loop systems, and other CPE products requiring one-channel analog telephone interfaces. The SI3201-BS is particularly relevant when a short-loop design needs integrated linefeed control, codec communication, ringing generation, and programmable battery voltage in one IC.
Before finalizing a PCB design, verify the complete 16-pin pinout, exposed-pad status, absolute maximum ratings, ringing waveform limits, and external network requirements against the manufacturer datasheet. The available search evidence confirms the 16-SOIC configuration and principal SLIC functions, but it does not provide a reliable pin-by-pin assignment table or complete electrical characteristic set.
This page consolidates verified distributor information, package details, interface capabilities, application guidance, and source links into an engineering-focused reference. It also clearly distinguishes documented characteristics from parameters that still require confirmation from the manufacturer datasheet, avoiding unsupported component substitutions.
Drop-in alternatives for SI3201-BS — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesSI3201-BS Specifications
| Product Type | Programmable CMOS subscriber line interface circuit (SLIC) with codec |
| Number of Channels | 1 channel |
| Supply Voltage Range | 3.13 V to 5.25 V |
| Operating Supply Current | 1 mA |
| Reported Supply Current | 88 mA |
| Interface Options | PCM, serial, and SPI |
| Ringing Voltage | 90 VPK maximum |
| Ringing Load at 4 kft | 5 REN |
| Ringing Load at 8 kft | 3 REN |
| Battery Supply | Integrated dynamic voltage output |
| Operating Temperature Range | -40 °C to +85 °C |
| Maximum Power Dissipation | 800 mW |
| Package | 16-pin SOIC |
| Mounting Type | Surface mount |
| Standard Packaging Quantity | 48 pieces per tube |
| RoHS Status | Compliant |
| Process Technology | Low-voltage CMOS |
| Integrated Functions | SLIC, codec, ringing-voltage generation, and battery-voltage generation |
SI3201-BS 16-pin soic Pin Configuration Guide
Pin configuration for SI3201-BS (16-pin soic package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for SI3201-BS.
Refer to the datasheet for full pin configuration.
Typical Applications
SI3201-BS is suitable for 6 applications: VoIP Terminal Adapter, Cable Telephony Equipment, Wireless Local Loop Terminal, Analog Phone Interface Card, Customer Premises Equipment, Telephone Ringing and Hook Control.
VoIP Terminal Adapter
The SI3201-BS fits a short-loop VoIP terminal adapter because it combines a programmable analog line interface, codec communication, ringing generation, and dynamic battery generation in one 16-pin SOIC. Its documented supply range of 3.13 V to 5.25 V allows integration with regulated 3.3 V or 5 V system rails, while the internal balanced ringing source supports up to 90 VPK. In a terminal adapter, the device bridges the analog subscriber line and the digital voice processor while managing ring voltage, hook state, linefeed behavior, and battery voltage under software control. The principal design trade-off is that the complete line network, protection network, ringing cadence, and thermal margin must be verified against the exact datasheet and target telephone network before production.
Cable Telephony Equipment
The SI3201-BS is applicable to cable telephony equipment requiring a compact one-channel analog telephone interface. Its integrated SLIC, codec, ringing, and battery functions reduce the component count compared with a discrete line-interface implementation, and its programmable control permits configuration through PCM, serial, or SPI. The 16-pin SOIC package is practical for CPE boards where every connector and exposed pad affects layout. For a cable modem or residential gateway, the interface must meet the intended ringing voltage and REN limits, including the documented 90 VPK maximum, 5 REN at 4 kft, and 3 REN at 8 kft. External protection and isolation requirements remain product-specific and should not be assumed to be provided by the IC.
Wireless Local Loop Terminal
The SI3201-BS can support a wireless local-loop terminal that presents an analog telephone line to customer equipment while a digital modem carries voice traffic over the wireless link. Its integrated codec and programmable SLIC provide the required line and audio interface functions, and its operating range of 3.13 V to 5.25 V suits low-voltage embedded platforms. The device supports PCM, serial, and SPI interfaces, giving designers flexibility in connecting it to a baseband or digital signal processor. The key engineering consideration is validating the analog line behavior across loop lengths and telephone loads, including ringing at 90 VPK and the stated REN limits. Maximum power dissipation is reported as 800 mW, so thermal design should include PCB copper and the final enclosure environment.
Analog Phone Interface Card
The SI3201-BS is appropriate for a dedicated analog phone interface card where one subscriber line must connect to a digital switching or codec platform. The integrated one-channel SLIC, codec interface, ringing generator, and dynamic battery supply allow the card to provide a complete line-side function without requiring separate programmable linefeed ICs. The 16-pin SOIC package supports compact board construction, while the 3.13 V to 5.25 V supply range supports regulated system rails. Designers should confirm the exact signal interface, firmware register map, pinout, and timing before routing the PCB. Ring voltage and REN must be checked at the shortest and longest supported loop lengths, and the maximum reported 800 mW dissipation requires adequate thermal margin.
Customer Premises Equipment
The SI3201-BS supports customer premises equipment that must reproduce standard analog telephone behavior for connected handsets or fax equipment. Software-programmable ringing and battery voltage give the equipment a familiar line presentation, while the integrated codec interface connects the analog line to the embedded system. The device operates from 3.13 V to 5.25 V and is available in a 16-pin SOIC, making it suitable for compact CPE platforms such as terminal adapters, cable gateways, and wireless local-loop units. Implementation should include the required line protection, isolation, connector surge protection, and ringing calibration. The available evidence reports both 1 mA operating supply current and 88 mA under an unspecified condition, so the exact manufacturer test conditions must be checked before sizing the power supply.
Telephone Ringing and Hook Control
The SI3201-BS is suited to telephone ringing and hook-control functions because its integrated line driver supports software-programmable internal balanced ringing up to 90 VPK and dynamic battery-voltage output. The documented loading limits are 5 REN at 4 kft and 3 REN at 8 kft, which provide design constraints for telephones and other ringers connected to the line. In a CPE design, the controller can vary ringing and battery conditions while the SLIC handles the analog line interface. Correct use requires checking ring cadence, on-hook voltage, off-hook loading, and regional limits against the manufacturer datasheet. The line protection network must also be designed independently so that external transients do not bypass or overstress the IC.
Engineering reference data for SI3201-BS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Product Type | Programmable CMOS SLIC with codec |
| Channel Count | 1 channel |
| Supply Voltage Range | 3.13 V to 5.25 V |
| Digital Interface Options | PCM, serial, and SPI |
| Ringing Voltage | 90 VPK maximum |
| Ringing Load | 5 REN at 4 kft; 3 REN at 8 kft |
| Maximum Power Dissipation | 800 mW |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 16-pin SOIC |
| Brand | Skyworks Solutions Inc. |
Key Differentiators
- Integration reduces separate line-interface components (vs Discrete SLIC and codec implementation)
- Programmable ringing supports different loop conditions (vs Fixed-voltage ringing circuit)
- Multiple host-interface options (vs Single-interface SLIC)
Design Notes
Obtain the exact SI3201-BS pin assignment and exposed-pad status before routing the PCB; the available evidence confirms a 16-pin SOIC but does not provide a trustworthy pin-by-pin table. Keep the high-voltage ringing path separate from low-level codec and supply traces, minimize loop area around line-driver connections, and place protection components close to the line connector. Compliance with isolation and surge requirements must be demonstrated at the complete board level rather than inferred from the IC alone.
Do not calculate the power budget from the isolated 1 mA or 88 mA current figures until their test conditions have been reconciled. The manufacturer listing states a maximum power dissipation of 800 mW, but maximum dissipation is not a normal operating target. Verify the actual voltage, codec activity, line state, and ringing mode in the datasheet, then provide regulator headroom and local decoupling for the 3.13 V to 5.25 V operating range.
Do not use maximum ringing capability as a design target. The SI3201-BS supports up to 90 VPK balanced ringing, but the verified 5 REN at 4 kft and 3 REN at 8 kft limits show that load capability depends on loop length. Check the connected telephone set, cable length, ring cadence, on-hook leakage, and applicable country requirements before enabling high ring voltage in production firmware.
Provide enough PCB copper to keep the SI3201-BS within its verified operating and absolute-maximum limits. The available source reports a maximum device power dissipation of 800 mW, which requires a system-level thermal analysis when the device operates near that limit. Use the exact package thermal data from the manufacturer datasheet and account for copper area, airflow, enclosure temperature, adjacent regulators, and the temperature increase over the full product operating range.
Compliance Information
RoHS compliance is reported in the verified SI3201-BS datasheet listing. No verified evidence for REACH, AEC-Q100, lead-free status, halogen-free status, or conflict-minerals compliance was supplied.