SI2457-C-FS Equivalent & Substitute Parts

Part Overview

The SI2457-C-FS is a 56k modem interface IC manufactured by Skyworks Solutions Inc., designed for system-side applications supporting multiple modem standards including V.21, V.22, V.23, V.32, V.34, V.90, Bell 103, and Bell 212A protocols. This component is classified as Not For New Designs, indicating it has reached end-of-life status. For new applications or ongoing production requiring equivalent functionality, direct substitutes with active product status are available from the same manufacturer.

Substiute Parts

SI2457-C-FS

Skyworks Solutions Inc.In Stock: 2149SI2457-C-FS Datasheet

Current PartRFQ

SI2457-D-FS

Skyworks Solutions Inc.In Stock: 1347SI2457-D-FS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI2457-C-FS is determined by strict alignment across the following parameters:

• Manufacturer & Series: Must be Skyworks Solutions Inc. ISOmodem® series to ensure protocol compatibility and pinout equivalence
• Data Format Support: Must support all modem standards (V.21, V.22, V.23, V.32, V.34, V.90, Bell 103, Bell 212A)
• Baud Rate: Must maintain 56k capability
• Supply Voltage: Must operate within 3V – 3.6V range
• Package & Mounting: Must use identical 16-SOIC surface mount package with matching physical dimensions
• Moisture Sensitivity: Must maintain MSL 3 classification

The SI2457-D-FS meets all substitution criteria and is the direct equivalent part for this application.

Parameter Comparison

Engineering Selection Recommendations

The SI2457-D-FS is the appropriate selection for applications currently using or requiring SI2457-C-FS functionality. Both parts share identical electrical specifications, package geometry, and protocol support. The SI2457-D-FS carries Active product status, ensuring continued availability and manufacturing support. Additionally, the SI2457-D-FS provides ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for component procurement in regulated industries.

For designs currently implemented with SI2457-C-FS, direct substitution with SI2457-D-FS requires no circuit modifications, PCB layout changes, or firmware adjustments due to full electrical and mechanical equivalence.

Frequently Asked Questions (FAQ)

Q: Can SI2457-D-FS be used as a direct replacement for SI2457-C-FS?

A: Yes. Both parts are identical in electrical performance, data format support, baud rate capability, supply voltage range, package type, and moisture sensitivity classification. No design changes are required.

Q: What is the difference between SI2457-C-FS and SI2457-D-FS?

A: The primary difference is product status. SI2457-C-FS is Not For New Designs, while SI2457-D-FS is Active. SI2457-D-FS also includes ROHS3 compliance and REACH unaffected certifications. Functionally and electrically, both parts are equivalent.

Q: Are there any package or pinout differences?

A: No. Both parts use the identical 16-SOIC package with 0.154" width (3.90mm). Pinout and PCB footprint compatibility is guaranteed.

Q: What does MSL 3 (168 Hours) mean for handling?

A: MSL 3 indicates Moisture Sensitivity Level 3, requiring storage in controlled humidity conditions. The 168-hour specification defines the maximum floor life after moisture exposure before the component must be baked before soldering.

Q: Is SI2457-D-FS suitable for new designs?

A: Yes. SI2457-D-FS carries Active product status and is appropriate for new design implementations requiring 56k modem interface functionality with ISOmodem® protocol support.