SI8631ED-AS Digital Isolator Equivalent & Substitute Parts

Part Overview

The SI8631ED-AS is an automotive-grade general purpose digital isolator manufactured by Skyworks Solutions Inc. This device provides 5000Vrms isolation across 3 channels with capacitive coupling technology, designed for automotive applications requiring high-speed signal isolation. The part is currently in active production status with 721 units in stock. Alternative models may be required due to application-specific channel requirements, inventory constraints, or design optimization for reduced channel count applications.

Substiute Parts

SI8631ED-AS

Skyworks Solutions Inc.In Stock: 799SI8631ED-AS Datasheet

Current PartRFQ

SI8610BD-B-IS

Skyworks Solutions Inc.In Stock: 1335SI8610BD-B-IS Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI8631ED-AS is determined by strict adherence to the following parameters:

Critical Matching Parameters:

• Isolation voltage: 5000Vrms (minimum requirement)
• Data rate: 150Mbps (minimum requirement)
• Supply voltage range: 2.5V to 5.5V (must be compatible)
• Operating temperature range: -40°C to 125°C (automotive requirement)
• Package type: 16-SOIC (0.295", 7.50mm Width) (PCB footprint compatibility)
• Grade: Automotive with AEC-Q100 qualification
• Technology: Capacitive coupling isolation method

Application-Dependent Parameters:

• Number of channels: 3 channels (SI8631ED-AS) - substitutes may have fewer channels if application requirements permit
• Common Mode Transient Immunity: 60kV/µs minimum (SI8631ED-AS) - substitutes with lower CMTI may be acceptable for applications with reduced EMI exposure
• Propagation delay: 13ns maximum (SI8631ED-AS) - substitutes with equal or lower delay acceptable

The SI8610BD-B-IS qualifies as a parametric equivalent for applications requiring single-channel isolation, provided the system design accommodates the reduced channel count and lower CMTI specification (35kV/µs versus 60kV/µs).

Parameter Comparison

Engineering Selection Recommendations

SI8631ED-AS Selection Criteria:

• Applications requiring 3-channel isolation in a single package
• Systems with high electromagnetic interference environments requiring 60kV/µs CMTI performance
• Designs where channel consolidation reduces PCB complexity and component count
• Automotive applications with AEC-Q100 compliance requirement confirmed

SI8610BD-B-IS Selection Criteria:

• Single-channel isolation requirements only
• Applications with lower EMI exposure where 35kV/µs CMTI is sufficient
• Designs prioritizing reduced component footprint for single-channel signal paths
• Cost optimization for applications not requiring multi-channel integration
• Inventory availability: 1226 units in stock versus 721 units for SI8631ED-AS

Compliance Verification: Both parts utilize capacitive coupling technology and operate within identical supply voltage and temperature ranges. The SI8610BD-B-IS maintains identical propagation delay and pulse width distortion characteristics. Automotive grade qualification status must be confirmed for the SI8610BD-B-IS prior to substitution in safety-critical automotive applications.

Frequently Asked Questions (FAQ)

Q: Can SI8610BD-B-IS replace SI8631ED-AS in all applications?

A: No. The SI8610BD-B-IS provides only 1 channel versus 3 channels in the SI8631ED-AS. Substitution is valid only for applications requiring single-channel isolation. Additionally, the CMTI specification is 35kV/µs versus 60kV/µs, which may impact performance in high-noise environments.

Q: Are the package footprints identical?

A: Yes. Both parts use 16-SOIC (0.295", 7.50mm Width) packaging with identical pin spacing and PCB layout compatibility.

Q: What is the significance of the 60kV/µs versus 35kV/µs CMTI difference?

A: Common Mode Transient Immunity (CMTI) specifies the maximum rate of change of common mode voltage that the isolator can withstand without introducing errors. The SI8631ED-AS with 60kV/µs provides superior performance in high-EMI automotive environments. The SI8610BD-B-IS at 35kV/µs is suitable for applications with lower transient stress.

Q: Do both parts meet automotive qualification standards?

A: The SI8631ED-AS carries AEC-Q100 automotive qualification. The SI8610BD-B-IS automotive grade status is not explicitly stated in the provided data and must be confirmed with the manufacturer before use in automotive applications.

Q: What is the propagation delay impact on system timing?

A: Both parts specify identical propagation delay of 13ns maximum for both rising and falling edges, with 4.5ns maximum pulse width distortion. Timing-critical applications will experience equivalent performance from either part.

Q: Are there supply voltage compatibility concerns?

A: No. Both parts operate across the identical 2.5V to 5.5V supply voltage range and are compatible with standard automotive power distribution systems.

Q: What inventory considerations apply to substitution?

A: SI8610BD-B-IS has 1226 units in stock compared to 721 units for SI8631ED-AS. For high-volume production requiring single-channel isolation, the substitute part offers superior inventory availability.