SI8635BD-B-IS Digital Isolator Equivalent & Substitute Parts

Part Overview

The SI8635BD-B-IS is a general purpose digital isolator manufactured by Skyworks Solutions Inc., featuring 5000Vrms isolation voltage across 3 channels with 150Mbps data rate and 35kV/µs common mode transient immunity. The device is housed in a 16-SOIC surface mount package and operates across the -40°C to 125°C temperature range. This part is currently active in production with 1033 units in stock.

Substitute parts are identified when design requirements permit relaxation of specific electrical parameters while maintaining functional compatibility within the same package form factor and isolation technology platform.

Substiute Parts

SI8635BD-B-IS

Skyworks Solutions Inc.In Stock: 1043SI8635BD-B-IS Datasheet

Current PartRFQ

SI8610BD-B-IS

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

Parametric EquivalentRFQ

ISO7330CQDWRQ1

Texas InstrumentsIn Stock: 8531ISO7330CQDWRQ1 Datasheet

SimilarRFQ

ISO7330FCDW

Texas InstrumentsIn Stock: 2150ISO7330FCDW Datasheet

SimilarRFQ

ISO7730DWR

Texas InstrumentsIn Stock: 8818ISO7730DWR Datasheet

SimilarRFQ

ISO7730FQDWQ1

Texas InstrumentsIn Stock: 4836ISO7730FQDWQ1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Factors:

• Package / Case: 16-SOIC (0.295", 7.50mm Width) — all substitutes must match
• Mounting Type: Surface Mount — all substitutes must match
• Technology: Capacitive Coupling — all substitutes must match
• Number of Channels: 3 — all substitutes must match
• Channel Type: Unidirectional — all substitutes must match
• Isolated Power: No — all substitutes must match

Electrical Parameter Tolerance:

• Voltage - Isolation: 5000Vrms or higher
• Data Rate: 150Mbps or higher
• Common Mode Transient Immunity: 35kV/µs or higher
• Propagation Delay: 13ns or lower
• Voltage - Supply: Must encompass 2.5V ~ 5.5V range

Substitute Classification:

Parametric Equivalent: SI8610BD-B-IS differs only in channel count (1 channel vs. 3 channels) and is suitable when single-channel isolation is sufficient.

Similar Substitutes: ISO7330CQDWRQ1, ISO7330FCDW, ISO7730DWR, and ISO7730FQDWQ1 are Texas Instruments devices that maintain 3-channel configuration and 16-SOIC packaging but operate at reduced isolation voltage (3000Vrms) or reduced data rate (25Mbps to 100Mbps). These are applicable only when system requirements permit lower electrical performance specifications.

Parameter Comparison

Engineering Selection Recommendations

SI8610BD-B-IS (Parametric Equivalent): Select this Skyworks part when single-channel isolation is functionally sufficient. Electrical performance matches the main part across all common parameters. Product status is active with ROHS3 compliance and improved moisture sensitivity rating (1 Year vs. 4 Weeks).

ISO7730DWR and ISO7730FQDWQ1 (Similar Substitutes): These Texas Instruments devices maintain 5000Vrms isolation and 3-channel configuration. ISO7730DWR offers extended operating temperature range (-55°C to 125°C) and higher common mode transient immunity (85kV/µs). ISO7730FQDWQ1 includes AEC-Q100 automotive qualification. Both operate at 100Mbps data rate, which is lower than the main part's 150Mbps. Select these when higher CMTI performance or automotive qualification is required and reduced data rate is acceptable.

ISO7330CQDWRQ1 and ISO7330FCDW (Similar Substitutes): These Texas Instruments devices reduce isolation voltage to 3000Vrms and data rate to 25Mbps. ISO7330CQDWRQ1 includes AEC-Q100 automotive qualification. Select only when system isolation requirements are 3000Vrms or lower and data rate requirements are 25Mbps or lower. Both offer improved moisture sensitivity (1 Year vs. 4 Weeks).

All substitute parts maintain the same 16-SOIC package, surface mount configuration, and capacitive coupling technology. Product status is active for all listed alternatives.

Frequently Asked Questions (FAQ)

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

A: SI8610BD-B-IS is a single-channel device versus the three-channel SI8635BD-B-IS. It is suitable only when your circuit requires single-channel isolation. Electrical performance parameters are identical. Verify your design requires only one isolated channel before substitution.

Q: What is the key difference between Skyworks and Texas Instruments substitutes?

A: Skyworks SI8635BD-B-IS and SI8610BD-B-IS use identical electrical specifications. Texas Instruments ISO7330 and ISO7730 series offer different performance trade-offs: ISO7330 reduces isolation voltage to 3000Vrms and data rate to 25Mbps; ISO7730 maintains 5000Vrms isolation but operates at 100Mbps data rate with higher common mode transient immunity (85kV/µs).

Q: Are the Texas Instruments ISO7730 parts direct replacements?

A: ISO7730DWR and ISO7730FQDWQ1 maintain matching isolation voltage (5000Vrms), channel count (3), and package (16-SOIC). Data rate is reduced to 100Mbps versus 150Mbps. These are suitable when your application data rate requirement is 100Mbps or lower. Both offer ROHS3 compliance and improved moisture sensitivity rating.

Q: What does AEC-Q100 qualification mean for automotive applications?

A: AEC-Q100 is an automotive electronics qualification standard. ISO7330CQDWRQ1 and ISO7730FQDWQ1 carry this qualification. Select these parts only if your application requires automotive-grade components. Non-automotive designs do not require this qualification.

Q: Can I use ISO7330 parts if my system only needs 3000Vrms isolation?

A: Yes. ISO7330CQDWRQ1 and ISO7330FCDW are suitable when your isolation voltage requirement is 3000Vrms or lower and data rate requirement is 25Mbps or lower. Both maintain 3-channel configuration and 16-SOIC packaging. Verify your system specifications before substitution.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging is suitable for lower-volume applications and manual assembly. Tape & Reel packaging is optimized for automated pick-and-place assembly. Both contain identical components. Select based on your manufacturing process requirements.

Q: Do all substitutes support the same supply voltage range?

A: No. SI8635BD-B-IS and SI8610BD-B-IS support 2.5V to 5.5V. ISO7330 series supports 3V to 5.5V (minimum 0.5V higher). ISO7730 series supports 2.25V to 5.5V (minimum 0.25V lower). Verify your supply voltage falls within the substitute part's specified range.