SI86SO20BC-AS Digital Isolator Equivalent & Substitute Parts

Part Overview

The SI86SO20BC-AS is a general-purpose digital isolator manufactured by Skyworks Solutions Inc., designed for automotive-grade applications requiring galvanic isolation. This 2-channel, unidirectional isolator operates at 3750Vrms isolation voltage with 150Mbps data rate and 150kV/µs common mode transient immunity. The device is actively produced and AEC-Q100 qualified for automotive environments.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across critical isolation, data rate, and packaging parameters. The SI86S620BC-AS serves as a parametric equivalent with minor variations in common mode transient immunity specifications.

Substiute Parts

SI86SO20BC-AS

Skyworks Solutions Inc.In Stock: 945SI86SO20BC-AS Datasheet

Current PartRFQ

SI86S620BC-AS

Skyworks Solutions Inc.In Stock: 1108SI86S620BC-AS Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI86SO20BC-AS is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Isolation voltage: 3750Vrms
• Number of channels: 2
• Channel configuration: Unidirectional (2 inputs on Side 1, 0 on Side 2)
• Data rate: 150Mbps
• Package type: 8-SOIC (0.154", 3.90mm Width)
• Supply voltage range: 2.25V ~ 5.5V
• Operating temperature range: -40°C ~ 125°C
• Grade: Automotive
• Qualification: AEC-Q100
• Technology: Capacitive Coupling

Allowable Variation Parameter:

• Common Mode Transient Immunity (CMTI): The SI86S620BC-AS operates at 100kV/µs minimum, compared to 150kV/µs for the SI86SO20BC-AS. This represents a reduced but still functional specification for applications not requiring maximum transient immunity.

The SI86S620BC-AS qualifies as a parametric equivalent substitute based on identical isolation voltage, channel count, data rate, package, supply voltage, temperature range, automotive grade, and AEC-Q100 qualification. The CMTI reduction does not affect mechanical or electrical compatibility in standard automotive isolation applications.

Parameter Comparison

Engineering Selection Recommendations

SI86SO20BC-AS Selection Criteria:

• Primary choice for applications requiring maximum common mode transient immunity at 150kV/µs
• Suitable for high-noise automotive environments with rapid voltage transients
• Active product status with established supply chain
• AEC-Q100 qualification confirms automotive reliability standards

SI86S620BC-AS Selection Criteria:

• Suitable for automotive applications where 100kV/µs CMTI meets system requirements
• Identical isolation voltage, data rate, package, and temperature specifications ensure direct functional compatibility
• Active product status with higher current inventory (1060 Pcs vs 932 Pcs)
• AEC-Q100 qualification and ROHS3 compliance maintained
• Reduced CMTI specification does not affect pin-to-pin compatibility or PCB layout requirements

Both parts maintain identical propagation delay, pulse width distortion, rise/fall time, supply voltage range, and operating temperature specifications. Selection between these parts depends solely on whether the application circuit experiences common mode transients exceeding 100kV/µs.

Frequently Asked Questions (FAQ)

Q: Can SI86S620BC-AS replace SI86SO20BC-AS in existing designs?

A: Yes, for applications where common mode transient immunity of 100kV/µs is sufficient. The SI86S620BC-AS maintains identical isolation voltage (3750Vrms), data rate (150Mbps), package (8-SOIC), supply voltage range (2.25-5.5V), operating temperature (-40 to 125°C), and automotive qualification (AEC-Q100). No PCB layout or schematic modifications are required. The only functional difference is reduced CMTI specification.

Q: What is the impact of reduced CMTI from 150kV/µs to 100kV/µs?

A: CMTI specification defines the maximum rate of voltage change across the isolation barrier that the device can tolerate without data corruption. The SI86S620BC-AS at 100kV/µs remains suitable for standard automotive isolation applications. Selection of the higher-CMTI SI86SO20BC-AS is necessary only in circuits with exceptionally fast voltage transients or high-noise environments.

Q: Are the packages physically identical?

A: Yes. Both parts use 8-SOIC (0.154", 3.90mm Width) packaging. Pin count, spacing, and PCB footprint are identical. No layout modifications are required for substitution.

Q: Do both parts meet automotive qualification standards?

A: Yes. Both SI86SO20BC-AS and SI86S620BC-AS carry Automotive grade classification and AEC-Q100 qualification. Both are ROHS3 compliant with MSL 2 (1 Year) moisture sensitivity rating.

Q: What is the difference in propagation delay between these parts?

A: Propagation delay specifications are identical: tpLH and tpHL both maximum 13.5ns for both parts. Timing performance in isolation applications is equivalent.

Q: Can I use SI86SO20BC-AS as a substitute for SI86S620BC-AS?

A: Yes. The SI86SO20BC-AS provides higher CMTI specification (150kV/µs vs 100kV/µs) and is therefore suitable for all applications where SI86S620BC-AS is used. This represents an upgrade path with enhanced transient immunity.