SI8442AB-C-IS Equivalent & Substitute Parts

Part Overview

The SI8442AB-C-IS is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 4-channel isolation with 2500Vrms isolation voltage and 1Mbps data rate. This component utilizes capacitive coupling technology in a 16-SOIC surface mount package. The part is marked as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing production support, legacy system maintenance, and design flexibility when the primary part becomes unavailable.

Substiute Parts

SI8442AB-C-IS

Skyworks Solutions Inc.In Stock: 107924SI8442AB-C-IS Datasheet

Current PartRFQ

SI8442AB-D-IS

Skyworks Solutions Inc.In Stock: 2218SI8442AB-D-IS Datasheet

DirectRFQ

SI8431AB-D-IS

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SI8442AB-C-IS is determined by the following critical parameters:

Direct Equivalent Criteria:

• Number of Channels: 4
• Voltage - Isolation: 2500Vrms
• Data Rate: 1Mbps
• Common Mode Transient Immunity: 25kV/µs (Typ)
• Package / Case: 16-SOIC (0.295", 7.50mm Width)
• Voltage - Supply: 2.7V ~ 5.5V
• Operating Temperature: -40°C ~ 125°C

Parametric Equivalent Criteria: Parts meeting most but not all critical parameters (such as reduced channel count) are classified as parametric equivalents. These require design review to confirm compatibility with the application's channel requirements.

The SI8442AB-D-IS qualifies as a direct equivalent, differing only in packaging format (Tube vs. standard packaging). The SI8431AB-D-IS qualifies as a parametric equivalent, featuring 3 channels instead of 4, with modified input/output configuration (2/1 instead of 2/2).

Parameter Comparison

Engineering Selection Recommendations

SI8442AB-D-IS (Direct Equivalent): This part is the primary substitute for the SI8442AB-C-IS. It maintains identical electrical specifications, channel configuration, and package format. The only difference is packaging format (Tube). This part carries ROHS3 compliance and REACH Unaffected status, providing regulatory advantages over the main part. Selection of this part requires no design modifications.

SI8431AB-D-IS (Parametric Equivalent): This part is suitable only when the application can operate with 3 channels instead of 4, with an asymmetric input/output configuration (2 inputs on Side 1, 1 input on Side 2). All other electrical parameters remain identical. This part also carries ROHS3 compliance and REACH Unaffected status. Design review is required to confirm channel count compatibility before selection.

All three parts share identical product status ("Not For New Designs"), indicating they are suitable for legacy system support and ongoing production of existing designs only.

Frequently Asked Questions (FAQ)

Q: Can SI8442AB-D-IS be used as a direct replacement for SI8442AB-C-IS?

A: Yes. The SI8442AB-D-IS is a direct equivalent with identical electrical specifications and channel configuration. The difference in packaging format (Tube) does not affect functional compatibility. No design modifications are required.

Q: What is the key difference between SI8442AB-C-IS and SI8431AB-D-IS?

A: The SI8431AB-D-IS has 3 channels with a 2/1 input configuration, compared to the 4-channel 2/2 configuration of the SI8442AB-C-IS. All other electrical parameters are identical. Use SI8431AB-D-IS only if your application requires 3 channels and can accommodate the asymmetric input/output arrangement.

Q: Are these parts suitable for new designs?

A: No. All three parts carry "Not For New Designs" status, indicating end-of-life classification. These parts are appropriate for legacy system maintenance, ongoing production of existing designs, and replacement inventory only.

Q: Do the substitute parts have better regulatory compliance?

A: Yes. Both SI8442AB-D-IS and SI8431AB-D-IS carry ROHS3 compliance and REACH Unaffected status, whereas the main part does not specify these certifications. This provides regulatory advantages for applications requiring environmental compliance documentation.

Q: Are the package dimensions identical across all three parts?

A: Yes. All three parts use the 16-SOIC (0.295", 7.50mm Width) package with identical footprint and mounting requirements. PCB layout modifications are not necessary when substituting between these parts.

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

A: All three parts have MSL 2A (4 Weeks), indicating identical moisture handling and storage requirements. Standard moisture control procedures apply to all parts.