SI2435-C-FT

Overview

The SI2435-C-FT is a V.34, V.17 fax modem system-side IC from the ISOmodem family, manufactured by Skyworks Solutions Inc. It operates within a digital supply voltage range of 3.0 to 3.6 V and supports an ambient temperature range of 0 to 70 °C for F-Grade devices. The component utilizes a 24-pin TSSOP package and communicates via UART or parallel interfaces. It provides fax connect rates up to 33,600 bps over the Public Switched Telephone Network (PSTN) and includes integrated direct access arrangement (DAA) capabilities.

Feature Summary

• Integrated silicon direct access arrangement (DAA) providing global telephone line interface compliance
• Supports ITU-T V.34 half duplex and V.17 fax communication protocols with automatic rate negotiation
• Includes data/fax/voice discriminator, DTMF detection/generation, and caller ID decoding
• Features firmware upgradeability and low-power sleep modes with wake-on-ring capability

Applications

• Fax machines
• Fax telephones
• Multifunctional printers
• Fax servers

Procurement Notes

Verify the specific suffix 'C' against official Skyworks documentation to confirm grade or revision details. Confirm RoHS compliance status through current datasheets. Ensure compatibility with the paired Si3018 DAA chip as specified in the chipset requirements. Validate that the 24-TSSOP package matches the target PCB footprint.

Selection Notes

Select this component for applications requiring a complete two-chip fax modem solution with minimal external components. It is suitable for designs needing global PTT compliance without separate DSPs or isolation transformers. Consider the Si2417 variant if only G3 fax support at 14.4 kbps is required instead of Super G3.

Part Context

This part belongs to the ISOmodem family developed originally by Silicon Laboratories and later acquired by Skyworks Solutions. The SI2435/C-FT designation indicates a specific grade or revision of the system-side modem controller designed to pair with the Si3018 DAA chip for PSTN connectivity.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.