SI8642BT-AS Equivalent & Substitute Parts

Part Overview

The SI8642BT-AS is a General Purpose Digital Isolator manufactured by Skyworks Solutions Inc., designed for automotive applications requiring high-voltage isolation and fast signal transmission. This device provides 5000Vrms isolation across 4 channels with 150Mbps data rate and 35kV/µs common mode transient immunity in a 16-SOIC surface mount package. The part is Active in product status and carries AEC-Q100 automotive qualification. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the Si864x series, ensuring functional interchangeability in automotive isolation circuits.

Key Parameters

Parameter	Value	Unit
Isolation Voltage	5000	Vrms
Number of Channels	4	—
Data Rate	150	Mbps
Common Mode Transient Immunity (Min)	35	kV/µs
Propagation Delay tpLH / tpHL (Max)	13 / 13	ns
Pulse Width Distortion (Max)	4.5	ns
Supply Voltage Range	2.375 ~ 5.5	V
Operating Temperature Range	-40 ~ 125	°C
Package / Case	16-SOIC (0.295", 7.50mm Width)	—
Grade	Automotive	—
Qualification	AEC-Q100	—

Substitute Part Grouping Explanation

Substitute parts within the Si864x series are qualified as equivalent when the following critical parameters match the SI8642BT-AS specification:

Isolation Voltage: 5000Vrms (mandatory match)
Number of Channels: 4 channels (mandatory match)
Data Rate: 150Mbps (mandatory match)
Common Mode Transient Immunity: 35kV/µs minimum (mandatory match)
Propagation Delay: 13ns maximum for both tpLH and tpHL (mandatory match)
Pulse Width Distortion: 4.5ns maximum (mandatory match)
Supply Voltage Range: 2.375V ~ 5.5V (mandatory match)
Operating Temperature Range: -40°C ~ 125°C (mandatory match)
Package / Case: 16-SOIC (0.295", 7.50mm Width) (mandatory match)
Grade: Automotive (mandatory match)
Qualification: AEC-Q100 (mandatory match)
Technology: Capacitive Coupling (mandatory match)
Mounting Type: Surface Mount (mandatory match)

The SI8642BD-AS meets all critical electrical and mechanical parameters, confirming direct substitution capability within automotive isolation applications.

Parameter Comparison

Parameter	SI8642BT-AS	SI8642BD-AS	Match
Manufacturer	Skyworks Solutions Inc.	Skyworks Solutions Inc.	Yes
Series	Si864x	Si864x	Yes
Product Status	Active	Active	Yes
Technology	Capacitive Coupling	Capacitive Coupling	Yes
Type	General Purpose	General Purpose	Yes
Isolated Power	Yes	Yes	Yes
Number of Channels	4	4	Yes
Inputs - Side 1/Side 2	2/2	2/2	Yes
Channel Type	Unidirectional	Unidirectional	Yes
Voltage - Isolation	5000Vrms	5000Vrms	Yes
Common Mode Transient Immunity (Min)	35kV/µs	35kV/µs	Yes
Data Rate	150Mbps	150Mbps	Yes
Propagation Delay tpLH / tpHL (Max)	13ns / 13ns	13ns / 13ns	Yes
Pulse Width Distortion (Max)	4.5ns	4.5ns	Yes
Rise / Fall Time (Typ)	2.5ns / 2.5ns	2.5ns / 2.5ns	Yes
Voltage - Supply	2.375V ~ 5.5V	2.375V ~ 5.5V	Yes
Grade	Automotive	Automotive	Yes
Qualification	AEC-Q100	AEC-Q100	Yes
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	Yes
Mounting Type	Surface Mount	Surface Mount	Yes
Package / Case	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	Yes
Supplier Device Package	16-SOIC	16-SOIC	Yes
Base Product Number	SI8642	SI8642	Yes
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	2A (4 Weeks)	Yes
ECCN	EAR99	EAR99	Yes
HTSUS	8542.39.0001	8542.39.0001	Yes

Engineering Selection Recommendations

The SI8642BD-AS is a direct parametric equivalent to the SI8642BT-AS. Both devices are manufactured by Skyworks Solutions Inc. within the Si864x series and maintain identical electrical specifications, mechanical packaging, and automotive compliance certifications. Selection between these parts is based on inventory availability and supply chain considerations rather than technical differentiation.

Both parts carry Active product status and AEC-Q100 qualification, confirming suitability for automotive isolation applications requiring 5000Vrms isolation, 150Mbps data transmission, and 35kV/µs common mode transient immunity across four channels. The 16-SOIC surface mount package and identical moisture sensitivity level (MSL 2A, 4 Weeks) ensure equivalent handling and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can SI8642BD-AS be used as a direct replacement for SI8642BT-AS in automotive circuits?

A: Yes. The SI8642BD-AS meets all electrical and mechanical parameters specified for the SI8642BT-AS, including isolation voltage, channel count, data rate, propagation delay, and automotive qualification. Direct substitution is supported without circuit modification.

Q: Are there differences in isolation performance between these parts?

A: No. Both parts provide identical 5000Vrms isolation voltage and 35kV/µs common mode transient immunity. Propagation delay, pulse width distortion, and rise/fall time specifications are identical.

Q: Do both parts require the same PCB layout and handling procedures?

A: Yes. Both parts use the 16-SOIC (0.295", 7.50mm Width) package with identical pin configuration and moisture sensitivity level (MSL 2A, 4 Weeks). PCB layout, soldering procedures, and storage requirements are equivalent.

Q: What is the operating temperature range for both parts?

A: Both SI8642BT-AS and SI8642BD-AS operate across -40°C to 125°C, meeting automotive temperature specifications.

Q: Are both parts qualified for automotive applications?

A: Yes. Both parts carry Automotive grade classification and AEC-Q100 qualification, confirming compliance with automotive reliability and quality standards.

Q: What supply voltage range do these parts support?

A: Both parts operate with supply voltage from 2.375V to 5.5V, providing compatibility with standard automotive power distribution systems.

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