SI32174-C-FM1

Telecom Overview

The SI32174-C-FM1 is a single-channel ProSLIC FXS interface IC from Skyworks Solutions. It operates on a 3.3 V supply (3.13–3.47 V) with 1.8 V or 3.3 V I/O options. The device supports PCM and SPI digital interfaces, featuring wideband voice capabilities and DTMF detection. It includes an integrated tracking DC-DC controller for battery voltage generation up to -110 V. Electrical specifications include a typical supply current of 44.6 mA in active off-hook mode and operation within a temperature range of 0°C to 70°C (F-grade). The component is housed in a 5x7 mm 42-pin QFN package.

Telecom Feature Summary

• Performs all BORSCHT functions for complete FXS telephony solutions
• Supports wideband voice transmission and DTMF detection
• Integrates a tracking DC-DC controller with direct MOSFET connection
• Enables global programmability via software-configurable parameters

Telecom Applications

• Customer Premise Equipment (CPE)
• VoIP DSL Gateways and Routers
• Wireless Local Loop (WLL)
• Integrated Access Devices (IAD)
• Analog Terminal Adapters (ATA)

Telecom Procurement Notes

Verify the specific F-grade temperature rating and -110 V battery voltage configuration against project requirements. Confirm the FM1 suffix indicates the correct tape-and-reel packaging format. Ensure compatibility with existing 3.3 V logic levels and thermal management strategies for the 42-pin QFN package during integration.

Telecom Selection Notes

Select this model for applications requiring wideband audio processing and DTMF detection capabilities. Verify that the -110 V maximum battery voltage meets the loop length and ringing voltage requirements. Consider the F-grade temperature range if operating environments exceed standard commercial limits but do not require industrial-grade specifications.

Telecom Part Context

This component belongs to the Si3217x-C family of single-chip FXS solutions. It is pin-compatible with other variants in the series, such as the Si32170, Si32171, and Si32176, allowing for design flexibility across different voltage ratings and feature sets while maintaining consistent board layouts.

Telecom Replacement Considerations

Direct substitutes within the Si3217x-C family include the Si32171-C-FM1 and Si32176-C-FM1, which share similar form factors and core functionalities but may differ in maximum battery voltage ratings or specific feature sets like DTMF detection.