SI8440AB-C-IS Equivalent & Substitute Parts

Part Overview

The SI8440AB-C-IS is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 4-channel capacitive coupling isolation with 2500Vrms isolation voltage and 1Mbps data rate. This component is classified as "Not For New Designs," making identification of functionally equivalent alternatives essential for ongoing system support and maintenance applications. The part is available in 16-SOIC surface mount packaging with 756 units currently in stock.

Substiute Parts

SI8440AB-C-IS

Skyworks Solutions Inc.In Stock: 811SI8440AB-C-IS Datasheet

Current PartRFQ

SI8440AB-D-IS

Skyworks Solutions Inc.In Stock: 1410SI8440AB-D-IS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI8440AB-C-IS is determined by the following critical parameters:

• Isolation Technology: Capacitive coupling architecture
• Channel Configuration: 4-channel unidirectional input (4 inputs on Side 1, 0 on Side 2)
• Isolation Voltage: 2500Vrms minimum
• Common Mode Transient Immunity: 25kV/µs (Typ) or greater
• Data Rate: 1Mbps or higher
• Supply Voltage Range: 2.7V ~ 5.5V compatibility
• Operating Temperature Range: -40°C ~ 125°C
• Package: 16-SOIC (0.295", 7.50mm Width) surface mount

The SI8440AB-D-IS meets all these criteria and is classified as a direct manufacturer substitute. Additional cross-references (ISO7340FCDWR, ISO7340FCDW) represent alternative architectures from different manufacturers and require full parameter verification before selection.

Parameter Comparison

Engineering Selection Recommendations

The SI8440AB-D-IS is a direct functional equivalent to the SI8440AB-C-IS. Both parts share identical electrical specifications, timing characteristics, and physical packaging. The SI8440AB-D-IS provides additional compliance documentation with ROHS3 certification and REACH status confirmation, which may be required for specific regulatory or procurement frameworks.

Both parts carry "Not For New Designs" status from the manufacturer, indicating they are legacy components. Selection between these two variants should be based on compliance requirements and inventory availability rather than technical performance differences.

Frequently Asked Questions (FAQ)

Q: Can SI8440AB-D-IS replace SI8440AB-C-IS in existing designs?

A: Yes. Both parts are identical in electrical performance, timing characteristics, and physical dimensions. Pin-for-pin compatibility is confirmed across all 16 pins in the 16-SOIC package.

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

A: This designation indicates the manufacturer no longer recommends these parts for new product development. However, they remain suitable for maintenance, repair, and legacy system support where the original specification must be maintained.

Q: Are there differences in compliance certifications between the two parts?

A: SI8440AB-D-IS explicitly lists ROHS3 compliance and REACH unaffected status. SI8440AB-C-IS does not specify these certifications in the provided documentation. If regulatory compliance documentation is required, SI8440AB-D-IS provides explicit certification records.

Q: What packaging format is used for both parts?

A: Both SI8440AB-C-IS and SI8440AB-D-IS are supplied in Tube packaging, 16-SOIC (0.295", 7.50mm Width) surface mount configuration. Handling and storage requirements are identical.

Q: Are the moisture sensitivity levels the same?

A: Yes. Both parts have MSL 2A (4 Weeks) rating, requiring identical storage and handling protocols to prevent moisture absorption damage.

Q: What is the current inventory status?

A: SI8440AB-C-IS has 756 units in stock. SI8440AB-D-IS has 1310 units in stock. Availability should be confirmed with the supplier before final procurement decisions.