SI2457-C-FTR Equivalent & Substitute Parts

Part Overview

The SI2457-C-FTR 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. The device is packaged in a 24-TSSOP surface mount configuration with a supply voltage range of 3V to 3.6V.

The SI2457-C-FTR carries a product status of "Not For New Designs," indicating that Skyworks Solutions Inc. has discontinued active development and support for this component. Organizations requiring equivalent functionality must identify suitable substitute components that maintain electrical and mechanical compatibility with existing designs.

Substiute Parts

SI2457-C-FTR

Skyworks Solutions Inc.In Stock: 10428SI2457-C-FTR Datasheet

Current PartRFQ

SI2457-D-FTR

Skyworks Solutions Inc.In Stock: 8682SI2457-D-FTR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Data Format Compatibility: The substitute must support all modem standards specified for the original part (V.21, V.22, V.23, V.32, V.34, V.90, Bell 103, Bell 212A)
• Baud Rate: Must maintain 56k baud rate capability
• Voltage Supply Range: Must operate within the 3V to 3.6V supply window
• Package Configuration: Must use identical 24-TSSOP package with 0.173" (4.40mm) width
• Mounting Technology: Must be surface mount compatible
• Moisture Sensitivity Level: Must meet or exceed MSL 3 (168 Hours) specification
• Export Classification: Must maintain ECCN 5A991B2 and HTSUS 8542.39.0001 compliance

The SI2457-D-FTR meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

The SI2457-D-FTR is the designated substitute for the SI2457-C-FTR. Both components are manufactured by Skyworks Solutions Inc. within the ISOmodem® series and maintain identical electrical specifications, package configuration, and compliance classifications.

The primary distinction between these parts is product lifecycle status. The SI2457-C-FTR is classified as "Not For New Designs," while the SI2457-D-FTR maintains "Active" status. This status difference reflects Skyworks Solutions Inc.'s ongoing support and availability commitment for the SI2457-D-FTR variant.

For applications currently using the SI2457-C-FTR, transition to the SI2457-D-FTR is supported by complete parameter alignment and identical package footprint. No circuit redesign or board layout modification is required for this substitution.

Frequently Asked Questions (FAQ)

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

A: Yes. The SI2457-D-FTR is a direct equivalent. Both parts share identical electrical specifications, modem protocol support (V.21, V.22, V.23, V.32, V.34, V.90, Bell 103, Bell 212A), baud rate (56k), supply voltage range (3V–3.6V), and 24-TSSOP package configuration. No circuit modifications are required.

Q: What is the significance of the "Not For New Designs" status on the SI2457-C-FTR?

A: This status indicates that Skyworks Solutions Inc. has concluded active development and support for the SI2457-C-FTR variant. The SI2457-D-FTR, with "Active" status, represents the current supported variant within the same product family and is recommended for new applications and ongoing production.

Q: Are there any differences in package dimensions between these parts?

A: No. Both the SI2457-C-FTR and SI2457-D-FTR use the identical 24-TSSOP package with 0.173" (4.40mm) width. PCB footprints and mounting requirements are identical.

Q: Do both parts meet the same moisture sensitivity requirements?

A: Yes. Both parts are classified as MSL 3 (168 Hours), indicating identical moisture sensitivity specifications and handling requirements during storage and assembly.

Q: Are export classifications identical for both parts?

A: Yes. Both the SI2457-C-FTR and SI2457-D-FTR maintain the same ECCN classification (5A991B2) and HTSUS code (8542.39.0001), ensuring consistent compliance with export regulations.