SI8631BT-AS Equivalent & Substitute Parts

Part Overview

The SI8631BT-AS is an automotive-grade general purpose digital isolator manufactured by Skyworks Solutions Inc. This device provides galvanic isolation of 5000Vrms across 3 channels with a maximum common mode transient immunity (CMTI) of 60kV/µs and data rate of 150Mbps. The part is packaged in a 16-SOIC surface mount configuration and operates across the automotive temperature range of -40°C to 125°C with AEC-Q100 qualification.

The SI8631BT-AS maintains Active product status with 926 units currently in stock. Identification of equivalent and substitute parts is necessary to support supply chain continuity, design flexibility, and procurement optimization while maintaining electrical and mechanical compatibility within specified parameters.

Substiute Parts

SI8631BT-AS

Skyworks Solutions Inc.In Stock: 1032SI8631BT-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 of the SI8631BT-AS is evaluated based on the following critical parameters that define functional compatibility:

Isolation Voltage: Both the main part and substitute must maintain 5000Vrms isolation rating to preserve galvanic separation requirements.

Supply Voltage Range: Both parts operate within 2.5V to 5.5V, ensuring compatible power supply integration.

Data Rate: Both parts support 150Mbps, maintaining signal transmission speed specifications.

Operating Temperature Range: Both parts function across -40°C to 125°C, supporting automotive environmental requirements.

Package Configuration: Both parts use 16-SOIC (0.295", 7.50mm Width) surface mount packaging, ensuring mechanical and footprint compatibility on printed circuit boards.

Technology Platform: Both parts employ capacitive coupling isolation technology, maintaining consistent electrical isolation methodology.

Channel Configuration Variance: The SI8610BD-B-IS provides 1 channel versus the SI8631BT-AS 3-channel configuration. This represents a functional reduction and is applicable only in applications requiring single-channel isolation.

Common Mode Transient Immunity: The SI8631BT-AS specifies 60kV/µs minimum CMTI, while the SI8610BD-B-IS specifies 35kV/µs minimum CMTI. The substitute exhibits lower CMTI performance and is suitable only for applications with reduced transient immunity requirements.

Parameter Comparison

Engineering Selection Recommendations

SI8631BT-AS Selection Criteria:

Select the SI8631BT-AS when applications require three isolated channels with 60kV/µs common mode transient immunity. This part is appropriate for multi-channel isolation architectures in automotive systems requiring high transient immunity performance. The part maintains Active product status with AEC-Q100 automotive qualification and is currently available with 926 units in stock.

SI8610BD-B-IS Selection Criteria:

The SI8610BD-B-IS is applicable only in single-channel isolation applications where the reduced 35kV/µs CMTI specification is acceptable. This substitute is suitable for designs requiring only one isolated channel and can tolerate lower transient immunity performance. The part maintains Active product status and is available with 1226 units in stock. RoHS3 compliance and REACH unaffected status are documented for this substitute.

Substitution Limitations:

The SI8610BD-B-IS cannot serve as a direct replacement for the SI8631BT-AS in applications requiring three channels or 60kV/µs CMTI performance. Circuit redesign is necessary to accommodate the single-channel configuration and reduced transient immunity specification.

Frequently Asked Questions (FAQ)

Q: Can the SI8610BD-B-IS replace the SI8631BT-AS in a three-channel isolation application?

A: No. The SI8610BD-B-IS provides only one isolated channel, while the SI8631BT-AS provides three channels. Substitution requires circuit redesign to accommodate the reduced channel count or use of multiple SI8610BD-B-IS devices.

Q: What is the impact of the 35kV/µs CMTI specification on the SI8610BD-B-IS compared to the 60kV/µs specification of the SI8631BT-AS?

A: The SI8610BD-B-IS exhibits lower common mode transient immunity. Applications experiencing common mode transients exceeding 35kV/µs may experience signal integrity degradation with the substitute part. Verify that application transient conditions remain within the 35kV/µs specification before substitution.

Q: Are the package and mounting configurations identical between these parts?

A: Yes. Both the SI8631BT-AS and SI8610BD-B-IS use 16-SOIC (0.295", 7.50mm Width) surface mount packaging. Printed circuit board footprints are mechanically compatible.

Q: Do both parts support the same supply voltage range?

A: Yes. Both parts operate within 2.5V to 5.5V supply voltage range, ensuring compatible power supply integration.

Q: What is the data rate specification for both parts?

A: Both the SI8631BT-AS and SI8610BD-B-IS support 150Mbps data rate, maintaining identical signal transmission speed.

Q: Are both parts qualified for automotive applications?

A: The SI8631BT-AS carries AEC-Q100 automotive qualification. The SI8610BD-B-IS product status documentation does not explicitly list AEC-Q100 qualification in the provided parameters. Verify automotive qualification requirements before substitution in safety-critical automotive applications.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -40°C to 125°C, supporting automotive environmental requirements.

Q: How do the propagation delay specifications compare?

A: Both parts specify identical maximum propagation delay of 13ns for both tpLH and tpHL transitions, ensuring equivalent timing performance.