SI2401-FS Equivalent & Substitute Parts

Part Overview

The SI2401-FS is a 2.4k modem interface IC manufactured by Skyworks Solutions Inc., designed for system-side applications supporting V.21, V.22, V.23, Bell 103, and Bell 212A data formats. This component is classified as obsolete, which necessitates identification of active equivalent parts to maintain design continuity and ensure long-term component availability for new production and field service applications.

Substiute Parts

SI2401-FS

Skyworks Solutions Inc.In Stock: 9051SI2401-FS Datasheet

Current PartRFQ

SI2404-D-FS

Skyworks Solutions Inc.In Stock: 69851SI2404-D-FS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SI2404-D-FS qualifies as a direct substitute for the SI2401-FS based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Identical package and case specification: 16-SOIC (0.154", 3.90mm Width)
• Identical mounting type: Surface Mount
• Identical supply voltage range: 3V ~ 3.6V
• Identical baud rate specification: 2.4k
• Identical moisture sensitivity level: MSL 3 (168 Hours)
• Identical manufacturer: Skyworks Solutions Inc.
• Identical series classification: ISOmodem®
• Identical export classification: ECCN EAR99
• Identical tariff code: HTSUS 8542.39.0001

Functional Enhancement: The SI2404-D-FS supports an extended data format set that includes V.29 in addition to V.21, V.22, V.23, Bell 103, and Bell 212A, providing backward compatibility with the SI2401-FS protocol support while enabling additional modem standard capability.

Parameter Comparison

Engineering Selection Recommendations

The SI2404-D-FS is the designated manufacturer substitute for the obsolete SI2401-FS. Selection of the SI2404-D-FS is supported by:

• Product Status Transition: The SI2404-D-FS maintains active production status, ensuring continued availability and supply chain reliability compared to the obsolete SI2401-FS.
• Electrical Compatibility: Identical supply voltage range (3V ~ 3.6V) and baud rate specification (2.4k) ensure direct functional compatibility in existing circuit designs.
• Mechanical Compatibility: Identical 16-SOIC package dimensions and surface mount configuration enable direct PCB footprint compatibility without layout modifications.
• Compliance Enhancement: The SI2404-D-FS provides ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.
• Protocol Backward Compatibility: The SI2404-D-FS supports all data formats of the SI2401-FS (V.21, V.22, V.23, Bell 103, Bell 212A) with the addition of V.29 capability.

Frequently Asked Questions (FAQ)

Q: Can the SI2404-D-FS be used as a direct replacement for the SI2401-FS without PCB modifications?

A: Yes. The SI2404-D-FS shares identical package specifications (16-SOIC), pin count, mounting type (surface mount), and electrical parameters (3V ~ 3.6V supply, 2.4k baud rate). No PCB layout changes are required.

Q: What is the primary difference between the SI2401-FS and SI2404-D-FS?

A: The SI2404-D-FS adds support for the V.29 data format while maintaining full backward compatibility with all SI2401-FS supported protocols (V.21, V.22, V.23, Bell 103, Bell 212A). The SI2404-D-FS is also in active production status.

Q: Are there any compliance differences between these parts?

A: The SI2404-D-FS provides ROHS3 compliance and REACH unaffected status. The SI2401-FS compliance status is not specified. Both parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: What is the moisture sensitivity level for both parts?

A: Both the SI2401-FS and SI2404-D-FS are classified as MSL 3 with a 168-hour floor life requirement.

Q: Is the SI2404-D-FS available in the same packaging options as the SI2401-FS?

A: The SI2404-D-FS is supplied in tube packaging. Both parts use the 16-SOIC (0.154", 3.90mm Width) case specification.