SI8631BD-AS Equivalent & Substitute Parts

Part Overview

The SI8631BD-AS is an automotive-grade general purpose digital isolator manufactured by Skyworks Solutions Inc. This device provides 5000Vrms isolation across 3 channels with 150Mbps data rate capability, utilizing capacitive coupling technology. The part is qualified to AEC-Q100 automotive standards and operates across the -40°C to 125°C temperature range. The SI8631BD-AS is currently in active production status with 854 units available in inventory. Substitute parts are identified when equivalent isolation voltage, data rate, and package specifications are maintained while channel configuration or CMTI ratings may differ based on application requirements.

Substiute Parts

SI8631BD-AS

Skyworks Solutions Inc.In Stock: 903SI8631BD-AS Datasheet

Current PartRFQ

SI8610BD-B-IS

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SI8631BD-AS are identified based on strict parameter matching in the following categories:

Mandatory Matching Parameters:

• Voltage - Isolation: 5000Vrms (exact match required)
• Package / Case: 16-SOIC (0.295", 7.50mm Width) (exact match required)
• Data Rate: 150Mbps (exact match required)
• Voltage - Supply: 2.5V ~ 5.5V (exact match required)
• Operating Temperature: -40°C ~ 125°C (exact match required)
• Technology: Capacitive Coupling (exact match required)
• Mounting Type: Surface Mount (exact match required)

Variable Parameters (Application-Dependent):

• Number of Channels: May differ based on circuit requirements
• Inputs - Side 1/Side 2 configuration: May differ based on signal direction requirements
• Common Mode Transient Immunity (CMTI): May differ; lower CMTI values represent more conservative specifications

The SI8610BD-B-IS qualifies as a parametric equivalent because it maintains all mandatory matching parameters while reducing channel count from 3 to 1 and CMTI from 60kV/µs to 35kV/µs. This substitution is valid for applications requiring single-channel isolation with identical electrical and thermal performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

SI8631BD-AS Selection Criteria:

• Applications requiring 3-channel isolation with 2 inputs on primary side and 1 input on secondary side
• Systems demanding 60kV/µs common mode transient immunity
• Automotive-grade designs with AEC-Q100 qualification requirement
• Current inventory: 854 units available

SI8610BD-B-IS Selection Criteria:

• Applications requiring single-channel isolation only
• Systems where 35kV/µs CMTI specification is sufficient
• Automotive-grade designs with AEC-Q100 qualification requirement
• Higher inventory availability: 1226 units in stock
• Identical electrical performance in propagation delay, pulse width distortion, and rise/fall time characteristics

Both parts maintain active production status and identical compliance certifications (EAR99, HTSUS 8542.39.0001). Selection between these parts depends solely on channel count and CMTI requirements for the specific application circuit.

Frequently Asked Questions (FAQ)

Q: Can SI8610BD-B-IS replace SI8631BD-AS in all applications?

A: No. The SI8610BD-B-IS is a single-channel device, while the SI8631BD-AS provides 3 channels. Substitution is valid only for circuits requiring single-channel isolation. The SI8610BD-B-IS cannot provide the 2/1 input configuration of the SI8631BD-AS.

Q: What is the difference in Common Mode Transient Immunity between these parts?

A: The SI8631BD-AS specifies 60kV/µs minimum CMTI, while the SI8610BD-B-IS specifies 35kV/µs minimum CMTI. Both values are within the general purpose digital isolator category. Selection depends on application noise immunity requirements.

Q: Are the package dimensions identical?

A: Yes. Both parts use 16-SOIC (0.295", 7.50mm Width) packaging with identical surface mount footprints and PCB layout requirements.

Q: Do both parts meet automotive qualification standards?

A: The SI8631BD-AS carries explicit AEC-Q100 automotive qualification. The SI8610BD-B-IS is listed as automotive-grade. Verify specific AEC-Q100 certification status with the manufacturer for the SI8610BD-B-IS if this qualification is mandatory for your application.

Q: Are propagation delay and timing characteristics identical?

A: Yes. Both parts specify identical propagation delay (13ns max for both tpLH and tpHL), pulse width distortion (4.5ns max), and rise/fall time (2.5ns typical). Timing performance is equivalent across both devices.

Q: What is the supply voltage range for both parts?

A: Both the SI8631BD-AS and SI8610BD-B-IS operate with identical supply voltage range of 2.5V to 5.5V, allowing direct substitution in power supply designs.

Q: Is the data rate specification the same?

A: Yes. Both parts support 150Mbps data rate with identical isolation voltage of 5000Vrms and capacitive coupling technology.