SI8635BD-AS Equivalent & Substitute Parts

Part Overview

The SI8635BD-AS is an automotive-grade general purpose digital isolator manufactured by Skyworks Solutions Inc. This device provides 5000Vrms isolation across 3 unidirectional channels with a maximum data rate of 150Mbps and operates across the automotive temperature range of -40°C to 125°C. The SI8635BD-AS is classified as Active product status and utilizes capacitive coupling technology for signal isolation.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the constraints of the application. The SI8635BD-AS may require alternative components due to inventory availability, supply chain considerations, or application-specific channel requirements.

Substiute Parts

SI8635BD-AS

Skyworks Solutions Inc.In Stock: 962SI8635BD-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 logic for the SI8635BD-AS is based on the following critical parameters that must remain equivalent or superior:

Mandatory Equivalence Parameters:

• Voltage - Isolation: 5000Vrms (must match exactly)
• Data Rate: 150Mbps (must match or exceed)
• Voltage - Supply: 2.5V ~ 5.5V (must match or encompass)
• Operating Temperature Range: -40°C to 125°C (must match or exceed)
• Package / Case: 16-SOIC (0.295", 7.50mm Width) (must match exactly for PCB compatibility)
• Technology: Capacitive Coupling (must match)
• Grade: Automotive (must match)
• Qualification: AEC-Q100 (must match)

Flexible Parameters (may vary):

• Number of Channels: Can be reduced if application requires fewer isolated channels
• Common Mode Transient Immunity (CMTI): Can be reduced if application requirements permit
• Propagation Delay: Can vary within acceptable limits
• Pulse Width Distortion: Can vary within acceptable limits

The SI8610BD-B-IS is identified as a parametric equivalent substitute based on matching isolation voltage, data rate, supply voltage, operating temperature, package type, technology, and automotive qualification. The primary difference is channel count reduction from 3 to 1 channel, which constitutes a functional constraint rather than a performance degradation.

Parameter Comparison

Engineering Selection Recommendations

SI8635BD-AS Selection Criteria:

• Applications requiring 3 isolated channels within a single 16-SOIC package
• Systems requiring 60kV/µs common mode transient immunity
• Designs where channel density and integration are prioritized
• Active product status with established supply chain

SI8610BD-B-IS Selection Criteria:

• Applications requiring only 1 isolated channel
• Systems where 35kV/µs common mode transient immunity is sufficient
• Designs where single-channel isolation meets functional requirements
• Higher inventory availability (1226 Pcs vs 935 Pcs for main part)
• Active product status with established supply chain

Both parts maintain identical automotive qualification (AEC-Q100), identical package footprint (16-SOIC), and identical electrical performance for timing parameters. Selection between these parts is determined by channel count requirements and common mode transient immunity specifications of the target application.

Frequently Asked Questions (FAQ)

Q: Can SI8610BD-B-IS replace SI8635BD-AS in all applications?

A: No. The SI8610BD-B-IS provides only 1 isolated channel compared to the SI8635BD-AS 3-channel configuration. Substitution is valid only when the application requires single-channel isolation. Additionally, the SI8610BD-B-IS has a lower common mode transient immunity rating (35kV/µs vs 60kV/µs), which may not be acceptable in high-noise environments.

Q: Are the package dimensions identical between these parts?

A: Yes. Both SI8635BD-AS and SI8610BD-B-IS use the 16-SOIC (0.295", 7.50mm Width) package. PCB footprints are mechanically compatible.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both parts are automotive-grade components qualified to AEC-Q100 and operate across the -40°C to 125°C temperature range.

Q: What is the primary functional difference between these parts?

A: The SI8635BD-AS integrates 3 unidirectional isolated channels, while the SI8610BD-B-IS provides 1 unidirectional isolated channel. The SI8635BD-AS also offers superior common mode transient immunity (60kV/µs vs 35kV/µs).

Q: Are the supply voltage ranges identical?

A: Yes. Both parts operate with identical supply voltage range of 2.5V to 5.5V.

Q: Do these parts have identical data rates?

A: Yes. Both parts support 150Mbps maximum data rate.

Q: What is the moisture sensitivity level for both parts?

A: Both parts are classified as MSL 2A (4 Weeks), indicating identical moisture handling requirements.

Q: Can I use SI8635BD-AS as a substitute for SI8610BD-B-IS?

A: Yes, from an electrical and mechanical perspective. The SI8635BD-AS provides additional channels and superior common mode transient immunity. However, this substitution may introduce unnecessary cost and complexity if only single-channel isolation is required.