SI2434-C-FSR Equivalent & Substitute Parts

Part Overview

The SI2434-C-FSR is an ISOmodem system-side interface IC manufactured by Skyworks Solutions Inc., housed in a 16-SOIC surface mount package. This component implements V.34 modem functionality with 3.3V supply voltage. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for legacy system maintenance, repair operations, and continued support of existing installations.

Substiute Parts

SI2434-C-FSR

Skyworks Solutions Inc.In Stock: 4088SI2434-C-FSR Datasheet

Current PartRFQ

SI2434-D-FSR

Skyworks Solutions Inc.In Stock: 865SI2434-D-FSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The SI2434-D-FSR qualifies as a direct substitute based on the following alignment of critical parameters:

Matching Parameters:

• Identical manufacturer (Skyworks Solutions Inc.)
• Identical package type (16-SOIC, 0.154" width, 3.90mm)
• Identical mounting technology (Surface Mount)
• Identical MSL rating (3, 168 Hours)
• Identical base product number (SI2434)
• Identical ECCN and HTSUS classifications
• Compatible supply voltage range (3.3V falls within 3V ~ 3.6V specification)

Functional Enhancement: The SI2434-D-FSR supports extended data format protocols (V.21, V.22, V.23, V.29, V.32, Bell 103, Bell 212A) and higher baud rate capability (33.6k), while maintaining full backward compatibility with the V.34 format of the original part.

Parameter Comparison

Engineering Selection Recommendations

The SI2434-D-FSR is the designated substitute for SI2434-C-FSR applications. Selection is based on:

Product Status Alignment: The SI2434-D-FSR carries Active product status, ensuring continued manufacturing support and availability, whereas the original SI2434-C-FSR is designated "Not For New Designs."

Compliance Continuity: Both parts share identical ECCN (5A991B2) and HTSUS (8542.39.0001) classifications, maintaining regulatory and export compliance requirements.

Electrical Compatibility: The SI2434-D-FSR supply voltage range (3V ~ 3.6V) encompasses the original 3.3V specification, ensuring direct electrical compatibility without circuit modification.

Physical Interchangeability: Identical 16-SOIC package dimensions and surface mount configuration enable direct PCB-level replacement without layout changes.

Functional Capability: The SI2434-D-FSR supports all V.34 protocols required by the original part while providing extended protocol support (V.21, V.22, V.23, V.29, V.32, Bell 103, Bell 212A) and higher baud rate operation (33.6k).

Frequently Asked Questions (FAQ)

Q: Can SI2434-D-FSR replace SI2434-C-FSR in existing designs?

A: Yes. The SI2434-D-FSR is electrically and mechanically compatible. The 3.3V supply voltage of the original design falls within the 3V ~ 3.6V operating range of the substitute. Package dimensions and pinout are identical, enabling direct PCB replacement.

Q: What is the difference in protocol support between these parts?

A: The SI2434-C-FSR implements V.34 modem protocols. The SI2434-D-FSR supports V.34 plus additional protocols (V.21, V.22, V.23, V.29, V.32, Bell 103, Bell 212A) and operates at higher baud rates (33.6k). The substitute is functionally backward compatible with all V.34 applications.

Q: Are there any MSL (Moisture Sensitivity Level) differences?

A: No. Both parts carry identical MSL ratings of 3 (168 Hours), requiring the same moisture control and handling procedures during storage and assembly.

Q: Does the substitute affect export or regulatory compliance?

A: No. Both parts share identical ECCN (5A991B2) and HTSUS (8542.39.0001) classifications, maintaining the same export control and tariff treatment.

Q: Why is SI2434-C-FSR marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status. Skyworks Solutions Inc. recommends SI2434-D-FSR for new applications while supporting SI2434-C-FSR for legacy system maintenance and repair.

Q: Is the 16-SOIC package identical between both parts?

A: Yes. Both parts use the same 16-SOIC package with 0.154" width and 3.90mm dimensions, ensuring identical PCB footprints and assembly compatibility.