SI8420AB-C-ISR Equivalent & Substitute Parts

Part Overview

The SI8420AB-C-ISR is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 2500Vrms isolation across 2 channels with 1Mbps data rate capability. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for ongoing system support, legacy design maintenance, and procurement continuity when original inventory becomes unavailable.

Substiute Parts

SI8420AB-C-ISR

Skyworks Solutions Inc.In Stock: 965SI8420AB-C-ISR Datasheet

Current PartRFQ

SI8620AB-B-ISR

Skyworks Solutions Inc.In Stock: 24683SI8620AB-B-ISR Datasheet

DirectRFQ

SI8410AB-D-ISR

Skyworks Solutions Inc.In Stock: 2276SI8410AB-D-ISR Datasheet

Parametric EquivalentRFQ

SI8420AB-D-ISR

Skyworks Solutions Inc.In Stock: 1422SI8420AB-D-ISR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI8420AB-C-ISR is determined by the following critical parameters:

• Isolation Voltage: Must maintain 2500Vrms minimum
• Number of Channels: Must support 2 channels for direct replacement
• Channel Configuration: Unidirectional, 2 inputs on Side 1, 0 on Side 2
• Data Rate: Must support 1Mbps minimum
• Package: 8-SOIC form factor with identical pin pitch and dimensions
• Supply Voltage Range: Must encompass or exceed 2.7V ~ 5.5V
• Operating Temperature: Must cover -40°C ~ 125°C range
• Technology: Capacitive coupling architecture

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalent (SI8620AB-B-ISR): Maintains identical channel count, isolation voltage, and package while offering improved performance specifications and active product status.

Parametric Equivalents (SI8410AB-D-ISR, SI8420AB-D-ISR): Meet core isolation and packaging requirements but may differ in channel count or performance characteristics, suitable for applications where specific performance enhancements or reduced channel requirements are acceptable.

Parameter Comparison

Engineering Selection Recommendations

SI8620AB-B-ISR is the preferred substitute for new procurement and system redesigns. This part maintains full functional equivalence with the SI8420AB-C-ISR while offering active product status, ensuring long-term availability and manufacturing support. The SI8620AB-B-ISR provides enhanced common mode transient immunity (35kV/µs versus 25kV/µs) and improved rise/fall time characteristics, delivering superior noise immunity in high-speed switching environments. Supply voltage range extends to 2.5V, providing broader operational flexibility.

SI8420AB-D-ISR serves as a direct parametric equivalent with identical electrical specifications to the SI8420AB-C-ISR. This part is suitable for legacy system maintenance where exact performance matching is required, though it retains "Not For New Designs" status.

SI8410AB-D-ISR is applicable only in applications requiring single-channel isolation. This part maintains identical isolation voltage, data rate, and package specifications but reduces channel count from 2 to 1. Selection of this part requires circuit redesign to accommodate reduced channel availability.

All substitute parts maintain ROHS3 compliance and identical moisture sensitivity levels, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can SI8620AB-B-ISR directly replace SI8420AB-C-ISR without circuit modification?

A: Yes. The SI8620AB-B-ISR maintains identical channel count, isolation voltage, data rate, package form factor, and pin configuration. No circuit redesign is required. The enhanced performance specifications (higher CMTI and improved timing) are backward compatible with existing designs.

Q: Why is SI8410AB-D-ISR listed as a substitute if it has only 1 channel?

A: SI8410AB-D-ISR is a parametric equivalent meeting core isolation and packaging requirements. It is suitable only for applications where single-channel isolation is acceptable or where circuit redesign can accommodate reduced channel availability. Direct substitution without modification is not possible.

Q: What is the significance of "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. Existing inventory may remain available for a limited period. For new designs or long-term production, SI8620AB-B-ISR (Active status) is the appropriate selection.

Q: Are all substitute parts available in Tape & Reel packaging?

A: SI8620AB-B-ISR packaging is not specified in the provided data. Verify packaging availability with the supplier before finalizing procurement. SI8410AB-D-ISR and SI8420AB-D-ISR are available in Tape & Reel format.

Q: Does the supply voltage range difference between SI8620AB-B-ISR (2.5V ~ 5.5V) and SI8420AB-C-ISR (2.7V ~ 5.5V) affect compatibility?

A: The SI8620AB-B-ISR extends the lower supply voltage limit to 2.5V, providing broader operational range. This is a superset of the original specification and does not create compatibility issues. Existing designs operating at 2.7V or higher remain fully compatible.

Q: What is the impact of improved Common Mode Transient Immunity in SI8620AB-B-ISR?

A: The SI8620AB-B-ISR provides 35kV/µs CMTI compared to 25kV/µs in the SI8420AB-C-ISR. This enhancement improves noise rejection in high-speed switching applications and high-EMI environments. Existing designs benefit from this improvement without requiring modification.