SI8635ET-AS Digital Isolator Equivalent & Substitute Parts

Part Overview

The SI8635ET-AS is an automotive-grade general purpose digital isolator manufactured by Skyworks Solutions Inc. This device provides galvanic isolation using capacitive coupling technology with 5000Vrms isolation voltage across 3 unidirectional channels. The SI8635ET-AS is classified as Active product status and meets AEC-Q100 automotive qualification standards.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for this product category. The SI8635ET-AS may require substitution due to inventory constraints, supply chain availability, or application-specific channel requirements.

Substiute Parts

SI8635ET-AS

Skyworks Solutions Inc.In Stock: 1085SI8635ET-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 SI8635ET-AS is determined by the following critical parameters:

Mandatory Matching Parameters:

• Isolation voltage: 5000Vrms (exact match required)
• Package type: 16-SOIC (0.295", 7.50mm Width) (exact match required)
• Technology: Capacitive Coupling (exact match required)
• Supply voltage range: 2.5V–5.5V (exact match required)
• Operating temperature range: −40°C to +125°C (exact match required)
• Data rate: 150Mbps (exact match required)
• Mounting type: Surface Mount (exact match required)

Flexible Parameters (Substitution Allowed Within Limits):

• Number of channels: May be reduced if application circuit design accommodates fewer isolated channels
• Common Mode Transient Immunity (CMTI): May be lower than 60kV/µs if application does not require maximum CMTI performance
• Propagation delay: Must not exceed 13ns maximum specification

Compliance Requirements:

• Product status must be Active
• Manufacturer must be Skyworks Solutions Inc.
• Technology must remain Capacitive Coupling

The SI8610BD-B-IS meets all mandatory matching parameters and qualifies as a parametric equivalent. This substitute differs only in channel count (1 channel versus 3 channels) and CMTI specification (35kV/µs versus 60kV/µs), both of which are flexible parameters for substitution purposes.

Parameter Comparison

Engineering Selection Recommendations

SI8635ET-AS Selection Criteria:

• Applications requiring 3 isolated unidirectional channels within a single 16-SOIC package
• Systems requiring 60kV/µs Common Mode Transient Immunity performance
• Automotive-grade isolation with AEC-Q100 qualification
• 5000Vrms galvanic isolation with capacitive coupling technology
• Operating conditions within −40°C to +125°C temperature range

SI8610BD-B-IS Substitution Criteria:

• Applications requiring only 1 isolated unidirectional channel
• Systems where 35kV/µs Common Mode Transient Immunity is sufficient
• Identical 16-SOIC package footprint and pinout compatibility for single-channel isolation requirements
• Active product status with matching supply voltage and operating temperature specifications
• Equivalent propagation delay and pulse width distortion characteristics

Substitution Feasibility: The SI8610BD-B-IS is a valid parametric equivalent for applications where channel count reduction from 3 to 1 is acceptable and CMTI performance of 35kV/µs meets system requirements. Both devices maintain identical electrical performance in timing characteristics, data rate, and isolation voltage. Printed circuit board layout compatibility is maintained through identical package geometry and 16-SOIC form factor.

Frequently Asked Questions (FAQ)

Q: Can SI8610BD-B-IS replace SI8635ET-AS in all applications?

A: No. The SI8610BD-B-IS provides only 1 isolated channel compared to the SI8635ET-AS 3-channel configuration. Substitution is valid only when application circuit design requires a single isolated channel. Additionally, the reduced CMTI specification (35kV/µs versus 60kV/µs) must be verified as acceptable for the target application environment.

Q: Are the packages physically identical?

A: Yes. Both devices use the 16-SOIC (0.295", 7.50mm Width) package. Printed circuit board footprints are identical, enabling direct physical replacement on the same PCB layout.

Q: What is the key difference between these two parts?

A: The primary differences are channel count (3 versus 1) and Common Mode Transient Immunity specification (60kV/µs versus 35kV/µs). All other electrical parameters, including isolation voltage, data rate, propagation delay, supply voltage range, and operating temperature range, are identical.

Q: Do both parts meet automotive qualification requirements?

A: The SI8635ET-AS carries explicit AEC-Q100 automotive qualification. The SI8610BD-B-IS is manufactured by Skyworks Solutions Inc. with Active product status and identical operating temperature range (−40°C to +125°C), meeting automotive-grade specifications. Verify specific AEC-Q100 certification status with the manufacturer for the SI8610BD-B-IS if required by application standards.

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

A: Both SI8635ET-AS and SI8610BD-B-IS have MSL 2A (4 Weeks) rating, indicating identical moisture handling and storage requirements.

Q: Can I use SI8635ET-AS where SI8610BD-B-IS is specified?

A: Yes. The SI8635ET-AS provides additional channels (3 versus 1) and higher CMTI performance (60kV/µs versus 35kV/µs). It is a superset solution that exceeds SI8610BD-B-IS specifications. Verify that the 3-channel configuration and higher CMTI do not introduce unintended circuit behavior or cost implications for the application.

Q: What supply voltage range do both parts support?

A: Both SI8635ET-AS and SI8610BD-B-IS support identical supply voltage range of 2.5V to 5.5V, ensuring compatibility with standard logic supply rails.

Q: Are there any RoHS or REACH compliance differences?

A: The SI8610BD-B-IS is explicitly listed as ROHS3 Compliant and REACH Unaffected. Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.