SI8635ET-ASR Equivalent & Substitute Parts

Part Overview

The SI8635ET-ASR is an automotive-grade general purpose digital isolator manufactured by Skyworks Solutions Inc. This component provides galvanic isolation across 3 unidirectional channels with 5000Vrms isolation voltage rating and 60kV/µs common mode transient immunity. The device operates at data rates up to 150Mbps and is packaged in a 16-SOIC surface mount configuration qualified to AEC-Q100 automotive standards.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained within the allowed parameter specifications for digital isolator applications. The SI8635ET-ASR is currently in active product status with 931 pieces in stock inventory.

Substiute Parts

SI8635ET-ASR

Skyworks Solutions Inc.In Stock: 1016SI8635ET-ASR Datasheet

Current PartRFQ

SI8620BD-B-ISR

Skyworks Solutions Inc.In Stock: 22915SI8620BD-B-ISR Datasheet

Parametric EquivalentRFQ

SI8620ED-B-ISR

Skyworks Solutions Inc.In Stock: 19027SI8620ED-B-ISR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SI8635ET-ASR are identified based on the following critical parameters that determine functional compatibility:

Isolation Voltage (5000Vrms): All substitute parts maintain the same 5000Vrms isolation rating, ensuring equivalent galvanic isolation performance.

Package Type (16-SOIC): All substitute parts use the identical 16-SOIC (0.295", 7.50mm Width) surface mount package, enabling direct board-level replacement without layout modifications.

Supply Voltage Range (2.5V ~ 5.5V): All substitute parts operate within the same supply voltage specification.

Operating Temperature Range (-40°C ~ 125°C): All substitute parts support the full automotive temperature range.

Data Rate (150Mbps): All substitute parts maintain the same maximum data rate specification.

Technology (Capacitive Coupling): All substitute parts use identical isolation technology.

Manufacturer (Skyworks Solutions Inc.): All substitute parts are from the same manufacturer, ensuring consistent design and qualification standards.

The primary difference between the main part and substitute parts is the number of channels: the SI8635ET-ASR provides 3 channels, while the substitute parts (SI8620ED-B-ISR and SI8620BD-B-ISR) provide 2 channels. This reduction in channel count represents a functional subset and does not prevent substitution in applications requiring 2 or fewer isolated channels.

Parameter Comparison

Engineering Selection Recommendations

SI8620ED-B-ISR (Tape & Reel Packaging): This substitute part is suitable for applications requiring 2 isolated channels with 5000Vrms isolation. The device maintains identical propagation delay, pulse width distortion, and rise/fall time characteristics. The common mode transient immunity is reduced to 35kV/µs compared to the main part's 60kV/µs specification. This part is supplied in Tape & Reel packaging with 18,950 pieces in stock inventory and carries ROHS3 compliance and REACH unaffected status.

SI8620BD-B-ISR (Cut Tape & Digi-Reel Packaging): This substitute part provides equivalent electrical performance to SI8620ED-B-ISR with identical 2-channel configuration and 5000Vrms isolation rating. The primary distinction is packaging format (Cut Tape & Digi-Reel) with 22,900 pieces in stock inventory. This part also carries ROHS3 compliance and REACH unaffected status.

Both substitute parts are active products from Skyworks Solutions Inc. with automotive-grade qualification. Selection between SI8620ED-B-ISR and SI8620BD-B-ISR depends on packaging requirements and inventory availability rather than electrical performance differences.

Frequently Asked Questions (FAQ)

Q: Can SI8620ED-B-ISR or SI8620BD-B-ISR replace SI8635ET-ASR in all applications?

A: These parts are suitable substitutes only in applications requiring 2 or fewer isolated channels. The SI8635ET-ASR provides 3 channels, while both substitute parts provide 2 channels. If the application uses all 3 channels of the SI8635ET-ASR, substitution is not possible without circuit redesign.

Q: What is the difference in common mode transient immunity between the main part and substitute parts?

A: The SI8635ET-ASR specifies 60kV/µs minimum CMTI, while SI8620ED-B-ISR and SI8620BD-B-ISR specify 35kV/µs minimum CMTI. Applications with high-speed switching or high dV/dt environments may require the higher CMTI rating of the main part.

Q: Are the substitute parts automotive qualified?

A: The SI8620ED-B-ISR and SI8620BD-B-ISR are not explicitly listed with AEC-Q100 qualification in the provided specifications. The SI8635ET-ASR carries AEC-Q100 qualification. Automotive applications requiring AEC-Q100 certification should verify qualification status with the manufacturer.

Q: What is the difference between SI8620ED-B-ISR and SI8620BD-B-ISR?

A: Both parts are electrically identical with 2 channels, 5000Vrms isolation, and 150Mbps data rate. The difference is packaging format: SI8620ED-B-ISR is supplied in Tape & Reel (TR), while SI8620BD-B-ISR is supplied in Cut Tape (CT) & Digi-Reel. Selection depends on assembly process requirements and inventory availability.

Q: Are all parts compatible with the same PCB footprint?

A: Yes. All three parts use the 16-SOIC (0.295", 7.50mm Width) package, enabling direct board-level replacement without layout modifications.

Q: What are the supply voltage requirements for these parts?

A: All three parts operate with supply voltage range of 2.5V to 5.5V, providing compatibility across standard logic supply levels.

Q: Do the substitute parts have the same propagation delay specifications?

A: Yes. All three parts specify maximum propagation delay of 13ns for both tpLH and tpHL, with identical 4.5ns maximum pulse width distortion and 2.5ns typical rise/fall times.