SI8631BD-ASR Equivalent & Substitute Parts

Part Overview

The SI8631BD-ASR is a general purpose digital isolator manufactured by Skyworks Solutions Inc., designed for automotive applications with 5000Vrms isolation capability. This component features 3 channels with 2 inputs on Side 1 and 1 input on Side 2, operating at 150Mbps data rate with 60kV/µs common mode transient immunity. The part is qualified to AEC-Q100 automotive standards and operates across the temperature range of -40°C to 125°C. The SI8631BD-ASR is currently in active product status. Alternative models within the Skyworks SI86xx digital isolator family are available to address specific application requirements related to channel configuration, common mode transient immunity specifications, and packaging formats.

Substiute Parts

SI8631BD-ASR

Skyworks Solutions Inc.In Stock: 2223SI8631BD-ASR Datasheet

Current PartRFQ

SI8620BD-B-ISR

Skyworks Solutions Inc.In Stock: 22915SI8620BD-B-ISR Datasheet

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SI8620ED-B-ISR

Skyworks Solutions Inc.In Stock: 19027SI8620ED-B-ISR Datasheet

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SI8621BD-B-ISR

Skyworks Solutions Inc.In Stock: 4946SI8621BD-B-ISR Datasheet

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SI8621ED-B-ISR

Skyworks Solutions Inc.In Stock: 15665SI8621ED-B-ISR Datasheet

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SI8622BD-B-ISR

Skyworks Solutions Inc.In Stock: 15413SI8622BD-B-ISR Datasheet

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SI8631BD-B-ISR

Skyworks Solutions Inc.In Stock: 9448SI8631BD-B-ISR Datasheet

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SI8631ED-B-ISR

Skyworks Solutions Inc.In Stock: 25306SI8631ED-B-ISR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI8631BD-ASR is determined by the following critical parameters:

Primary Substitution Criteria:

• Voltage isolation rating: 5000Vrms (mandatory match)
• Package type: 16-SOIC (0.295", 7.50mm Width) (mandatory match)
• Data rate: 150Mbps (mandatory match)
• Supply voltage range: 2.5V ~ 5.5V (mandatory match)
• Operating temperature range: -40°C ~ 125°C (mandatory match)
• Technology: Capacitive Coupling (mandatory match)
• Mounting type: Surface Mount (mandatory match)

Secondary Substitution Criteria (Application-Dependent):

• Number of channels: 3 channels (SI8631 series) or 2 channels (SI8620, SI8621, SI8622 series)
• Channel configuration: Input distribution across Side 1 and Side 2
• Common mode transient immunity: 60kV/µs (SI8631BD-ASR) or 35kV/µs (substitute variants)
• Packaging format: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®

The SI8631BD-ASR features the highest common mode transient immunity specification (60kV/µs) within the substitute group. Parts with 35kV/µs CMTI are functionally compatible for applications not requiring the enhanced transient immunity performance. Channel count and configuration differences determine suitability based on specific isolation topology requirements.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Same Channel Configuration):

SI8631BD-B-ISR and SI8631ED-B-ISR are direct substitutes for the SI8631BD-ASR. Both maintain the 3-channel configuration with 2/1 input distribution. The primary difference is packaging format: SI8631BD-B-ISR is supplied in Cut Tape (CT) & Digi-Reel® format, while SI8631ED-B-ISR is supplied in Tape & Reel (TR) format. Both parts are active products with identical electrical specifications except for common mode transient immunity, which is specified at 35kV/µs compared to the 60kV/µs of the SI8631BD-ASR.

Reduced Channel Substitutes:

SI8620BD-B-ISR, SI8620ED-B-ISR, SI8621BD-B-ISR, SI8621ED-B-ISR, and SI8622BD-B-ISR are functionally compatible substitutes with reduced channel count (2 channels instead of 3). These parts are suitable for applications requiring fewer isolation channels. SI8620 series provides 2/0 input configuration, while SI8621 and SI8622 series provide 1/1 input configuration. All maintain 5000Vrms isolation, 150Mbps data rate, and identical timing specifications. Common mode transient immunity is specified at 35kV/µs for all reduced-channel variants.

Compliance and Qualification:

All substitute parts are active products manufactured by Skyworks Solutions Inc. using capacitive coupling technology. The SI8631BD-ASR carries AEC-Q100 automotive qualification. Substitute parts SI8631BD-B-ISR and SI8631ED-B-ISR maintain the same base product number (SI8631) and are suitable for automotive applications. Parts SI8620, SI8621, and SI8622 series are listed as ROHS3 Compliant and REACH Unaffected, with identical moisture sensitivity level (MSL 2A, 4 Weeks) and ECCN/HTSUS classifications.

Frequently Asked Questions (FAQ)

Q: Can SI8620BD-B-ISR replace SI8631BD-ASR in my application?

A: SI8620BD-B-ISR is functionally compatible if your application requires only 2 isolation channels with 2/0 input configuration instead of 3 channels. Both parts share identical isolation voltage (5000Vrms), data rate (150Mbps), supply voltage range (2.5V ~ 5.5V), operating temperature range (-40°C ~ 125°C), and package type (16-SOIC). The SI8620BD-B-ISR has lower common mode transient immunity (35kV/µs versus 60kV/µs), which may affect performance in high-speed transient environments.

Q: What is the difference between SI8631ED-B-ISR and SI8631BD-B-ISR?

A: Both parts are identical in electrical specifications and channel configuration (3 channels, 2/1 input distribution). The difference is packaging format: SI8631ED-B-ISR is supplied in Tape & Reel (TR) format, while SI8631BD-B-ISR is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on your assembly process requirements and volume needs.

Q: Is the SI8631BD-ASR automotive qualified?

A: Yes, the SI8631BD-ASR is qualified to AEC-Q100 automotive standards and operates across -40°C to 125°C. The substitute parts SI8631BD-B-ISR and SI8631ED-B-ISR share the same base product number (SI8631) and are suitable for automotive applications, though specific automotive qualification status should be confirmed with the manufacturer for critical applications.

Q: Why does SI8631BD-ASR have 60kV/µs CMTI while substitutes have 35kV/µs?

A: Common mode transient immunity (CMTI) specification differs between part variants within the SI86xx family. The SI8631BD-ASR specifies 60kV/µs CMTI, providing enhanced performance in high-speed transient environments. Substitute parts with 35kV/µs CMTI are suitable for applications with lower transient requirements. Application-specific transient immunity requirements determine whether the reduced CMTI specification is acceptable.

Q: Can I use SI8621BD-B-ISR instead of SI8631BD-ASR?

A: SI8621BD-B-ISR is compatible if your application requires only 2 isolation channels with 1/1 input configuration. Both parts maintain 5000Vrms isolation, 150Mbps data rate, identical timing characteristics, and 16-SOIC package. The SI8621BD-B-ISR has 2 channels versus 3 channels and lower CMTI (35kV/µs versus 60kV/µs). Verify that your isolation topology accommodates the reduced channel count and input distribution.

Q: What packaging formats are available for SI8631 digital isolators?

A: SI8631BD-ASR is supplied in Tape & Reel (TR) format. SI8631BD-B-ISR is available in Cut Tape (CT) & Digi-Reel® format, while SI8631ED-B-ISR is available in Tape & Reel (TR) format. Packaging format selection depends on assembly equipment compatibility and volume requirements. Both TR and CT formats maintain identical component specifications.

Q: Are all substitute parts RoHS compliant?

A: The SI8631BD-ASR does not specify RoHS status in the provided data. Substitute parts SI8620BD-B-ISR, SI8620ED-B-ISR, SI8621BD-B-ISR, SI8621ED-B-ISR, SI8622BD-B-ISR, SI8631BD-B-ISR, and SI8631ED-B-ISR are all listed as ROHS3 Compliant. Verify RoHS compliance requirements for your specific application and confirm with the manufacturer if needed.