SI2435-D2-FT

Modems - ICS And Modules Overview

The SI2435-D2-FT is a V.34 fax modem integrated circuit manufactured by Skyworks Solutions Inc., originally developed under Silicon Laboratories. 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 the F-Grade variant. The device provides data transmission speeds ranging from 14,400 bps to 33,600 bps over the Public Switched Telephone Network (PSTN). It utilizes a 24-pin TSSOP package and features both UART serial and parallel 8-bit interfaces for host communication.

Modems - ICS And Modules Feature Summary

• Integrated Direct Access Arrangement (DAA) providing global telephone line interface compliance without external transformers or relays
• Supports ITU-T V.34 half duplex fax protocols with automatic rate negotiation up to 33.6 kbps
• Includes built-in caller ID decoding for multiple global standards and DTMF detection/generation capabilities
• Offers firmware upgradeability and low-power modes including wake-on-ring sleep and complete powerdown states

Modems - ICS And Modules Applications

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

Modems - ICS And Modules Procurement Notes

Verify the specific suffix 'D2' against official Skyworks documentation to confirm exact revision status, as datasheets primarily reference the base Si2435 model. Confirm RoHS compliance and lead-free packaging requirements directly with the manufacturer or authorized distributors prior to procurement.

Modems - ICS And Modules Selection Notes

Select this component for applications requiring a compact, globally compliant fax modem solution that eliminates the need for separate DSPs or isolation transformers. Ensure the design accommodates the required 3.0V to 3.6V digital supply and supports either UART or parallel interface configurations based on system constraints.

Modems - ICS And Modules Part Context

This part belongs to the ISOmodem family, specifically designed as a two-chip fax modem solution when paired with the Si3018 DAA chip. It represents a third-generation direct access arrangement technology aimed at reducing board space and external component count for traditional PSTN fax applications.

Modems - ICS And Modules Replacement Considerations

The Si2417 serves as a compatible alternative within the same chipset family, offering similar functionality but limited to lower fax connect rates compared to the Si2435's V.34 capabilities.