SI8431AB-C-IS Equivalent & Substitute Parts

Part Overview

The SI8431AB-C-IS is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 3-channel isolation with 2500Vrms isolation voltage and 1Mbps data rate. This device utilizes capacitive coupling technology and is housed in a 16-SOIC package. The part is marked as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent substitute parts is necessary for ongoing production support, maintenance applications, and legacy system repairs where this isolator remains in active use.

Substiute Parts

SI8431AB-C-IS

Skyworks Solutions Inc.In Stock: 817SI8431AB-C-IS Datasheet

Current PartRFQ

SI8431AB-D-IS

Skyworks Solutions Inc.In Stock: 2389SI8431AB-D-IS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SI8431AB-C-IS is determined by the following critical parameters that must remain consistent:

• Isolation Voltage: 2500Vrms minimum
• Number of Channels: 3 channels
• Channel Configuration: 2 inputs on Side 1, 1 input on Side 2 (unidirectional)
• Data Rate: 1Mbps minimum
• Common Mode Transient Immunity: 25kV/µs (Typ) minimum
• Package Type: 16-SOIC (0.295", 7.50mm Width)
• Supply Voltage Range: 2.7V ~ 5.5V
• Operating Temperature Range: -40°C ~ 125°C

The direct substitute SI8431AB-D-IS from Skyworks Solutions Inc. maintains identical electrical specifications and package configuration, differing only in internal manufacturing or qualification parameters. Additional cross-manufacturer substitutes (ISO7731FDWR, ISO7231CDW, ISO7231CDWR, ISO7831DWR, ISO7231MDWR) from Texas Instruments are listed as compatible alternatives provided they meet all specified electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

The SI8431AB-D-IS is the primary direct substitute for the SI8431AB-C-IS, as both parts are manufactured by Skyworks Solutions Inc. and share identical electrical and mechanical specifications. Both devices carry "Not For New Designs" status, indicating they are legacy components suitable for replacement applications and ongoing production support only.

The SI8431AB-D-IS offers improved inventory availability (2316 pcs vs. 729 pcs) and includes ROHS3 compliance and REACH unaffected certifications, providing additional regulatory documentation for applications requiring compliance verification.

Cross-manufacturer alternatives from Texas Instruments (ISO7731FDWR, ISO7231CDW, ISO7231CDWR, ISO7831DWR, ISO7231MDWR) are listed as compatible substitutes only when their published datasheets confirm equivalence across all specified electrical parameters, package dimensions, and operating conditions.

Frequently Asked Questions (FAQ)

Q: Can SI8431AB-D-IS be used as a direct replacement for SI8431AB-C-IS?

A: Yes. Both parts are manufactured by Skyworks Solutions Inc. and maintain identical electrical specifications, channel configuration, isolation voltage, data rate, and 16-SOIC package dimensions. No circuit modifications are required.

Q: What is the significance of the "Not For New Designs" status?

A: This designation indicates the part has reached end-of-life and is no longer recommended for new product development. However, it remains available for legacy system support, maintenance, and replacement applications where the device is already in use.

Q: Are the Texas Instruments ISO773x series parts direct substitutes?

A: The ISO773x series parts are listed as compatible alternatives only when their datasheets confirm matching isolation voltage (2500Vrms), 3-channel configuration with 2/1 input distribution, 1Mbps data rate, 16-SOIC package, and identical operating temperature range (-40°C to 125°C). Physical verification against the specific part number datasheet is required before selection.

Q: Does package compatibility guarantee electrical compatibility?

A: No. While both the SI8431AB-C-IS and SI8431AB-D-IS use the 16-SOIC package, package compatibility alone does not ensure substitutability. All electrical parameters, including isolation voltage, channel count, data rate, and timing specifications, must match the original design requirements.

Q: What compliance certifications should be verified for substitute parts?

A: For the SI8431AB-D-IS, ROHS3 compliance and REACH unaffected status are documented. Applications requiring specific regulatory compliance should confirm that substitute parts carry equivalent certifications before implementation.