SI2401-FSR Equivalent & Substitute Parts

Part Overview

The SI2401-FSR is an ISOmodem® system-side interface IC manufactured by Skyworks Solutions Inc., designed for 2.4k modem applications supporting V.21, V.22, V.23, Bell 103, and Bell 212A data formats. The device is packaged in a 16-SOIC surface mount configuration with a supply voltage range of 3V to 3.6V.

The SI2401-FSR has reached obsolete product status. Locating equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or maintenance requirements for systems utilizing this interface IC.

Substiute Parts

SI2401-FSR

Skyworks Solutions Inc.In Stock: 22840SI2401-FSR Datasheet

Current PartRFQ

SI2404-D-FS

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

MFR RecommendedRFQ

SI2404-D-FSR

Skyworks Solutions Inc.In Stock: 3659SI2404-D-FSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SI2401-FSR are identified based on strict electrical and mechanical compatibility criteria. The following parameters determine valid substitution:

• Identical package type: 16-SOIC (0.154", 3.90mm Width)
• Matching supply voltage range: 3V ~ 3.6V
• Identical mounting type: Surface Mount
• Compatible data format support: minimum V.21, V.22, V.23, Bell 103, Bell 212A
• Identical baud rate specification: 2.4k
• Identical series classification: ISOmodem®
• Matching moisture sensitivity level: MSL 3 (168 Hours)

The SI2404-D-FS and SI2404-D-FSR meet all substitution criteria. Both are active-status ISOmodem® interface ICs with identical electrical specifications and package configurations. The primary difference between these substitutes is packaging format: SI2404-D-FS is supplied in Tube packaging, while SI2404-D-FSR is supplied in Tape & Reel (TR) format.

Parameter Comparison

Engineering Selection Recommendations

Both SI2404-D-FS and SI2404-D-FSR are functionally equivalent substitutes for the obsolete SI2401-FSR. Selection between these two active-status alternatives depends on procurement and assembly requirements:

SI2404-D-FS (Tube packaging) is suitable for applications requiring manual component handling or lower-volume assembly processes.

SI2404-D-FSR (Tape & Reel packaging) is appropriate for automated pick-and-place assembly operations and high-volume production environments.

The SI2404 series provides enhanced data format support, including V.29 protocol in addition to the V.21, V.22, V.23, Bell 103, and Bell 212A formats supported by the SI2401-FSR. This expanded capability ensures forward compatibility and broader protocol support in replacement designs.

SI2404-D-FS carries RoHS3 compliance and REACH Unaffected status, providing regulatory alignment for modern manufacturing and distribution requirements.

Frequently Asked Questions (FAQ)

Q: Can SI2404-D-FS and SI2404-D-FSR be used interchangeably with SI2401-FSR?

A: Yes. Both SI2404 variants meet all electrical and mechanical substitution criteria. The devices are pin-compatible, operate at identical supply voltages, support the same core data formats, and are packaged in identical 16-SOIC configurations. The only difference is packaging format (Tube versus Tape & Reel).

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

A: Both parts are electrically identical. SI2404-D-FS is supplied in Tube packaging for manual handling, while SI2404-D-FSR is supplied in Tape & Reel format for automated assembly. Selection depends on your assembly process requirements.

Q: Does the SI2404 support all data formats that the SI2401-FSR supports?

A: Yes. The SI2404 supports V.21, V.22, V.23, Bell 103, and Bell 212A formats identical to the SI2401-FSR. Additionally, the SI2404 includes V.29 protocol support, providing expanded capability.

Q: Are there any compliance differences between SI2401-FSR and the SI2404 substitutes?

A: The SI2401-FSR is obsolete with no current compliance certifications listed. SI2404-D-FS is RoHS3 compliant and REACH Unaffected. Both SI2404 variants carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications as the original part.

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

A: All three parts—SI2401-FSR, SI2404-D-FS, and SI2404-D-FSR—are classified as MSL 3 with a 168-hour floor life rating. Identical moisture handling and storage protocols apply across all variants.

Q: Can I use SI2404-D-FSR in a design originally specified for SI2401-FSR?

A: Yes. The SI2404-D-FSR is a direct functional substitute. No circuit modifications are required. The identical 16-SOIC package, pin configuration, supply voltage range, and supported data formats ensure seamless integration into existing designs.