SI8642ED-AS2 Equivalent & Substitute Parts

Part Overview

The SI8642ED-AS2 is a General Purpose Digital Isolator manufactured by Skyworks Solutions Inc., designed for automotive applications requiring galvanic isolation. This 4-channel capacitive coupling isolator operates at 5000Vrms isolation voltage with a maximum data rate of 150Mbps and common mode transient immunity of 35kV/µs. The device is qualified to AEC-Q100 automotive standards and operates across the temperature range of -40°C to 125°C in a 16-SOIC surface mount package.

The SI8642ED-AS2 is currently in active production status with 897 pieces available in inventory. Substitute parts are identified based on matching electrical performance parameters, isolation ratings, channel configuration, and automotive qualification requirements. Alternative models ensure design flexibility and supply chain continuity while maintaining functional equivalence.

Substiute Parts

SI8642ED-AS2

Skyworks Solutions Inc.In Stock: 920SI8642ED-AS2 Datasheet

Current PartRFQ

SI8642BD-AS

Skyworks Solutions Inc.In Stock: 1434SI8642BD-AS Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SI8642ED-AS2 are identified through strict parametric matching of electrical and mechanical specifications. The substitution logic is based on the following critical parameters that determine functional equivalence:

Isolation Voltage Rating: 5000Vrms isolation voltage is the primary electrical specification. All substitute parts must maintain this isolation rating to ensure system safety and regulatory compliance in automotive applications.

Channel Configuration: The 4-channel architecture with 2 forward and 2 reverse unidirectional channels defines the signal routing capability. Substitute parts must preserve this exact channel topology.

Data Rate and Timing: The 150Mbps maximum data rate, 35kV/µs common mode transient immunity, and propagation delay specifications (13ns maximum for both tpLH and tpHL) establish the signal integrity performance envelope. Substitute parts must meet or exceed these timing parameters.

Automotive Qualification: AEC-Q100 qualification and automotive grade designation are mandatory for applications requiring automotive compliance. All substitute parts must carry equivalent automotive certification.

Package and Mounting: The 16-SOIC (0.295", 7.50mm Width) surface mount package defines the physical footprint and PCB compatibility. Substitute parts must use the identical package specification.

Supply Voltage Range: The 2.375V to 5.5V supply voltage range establishes the power supply compatibility window. Substitute parts must support this voltage range.

The SI8642BD-AS meets all these critical parameters and is therefore classified as a parametric equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

The SI8642ED-AS2 and SI8642BD-AS are parametric equivalents within the Si864x series of automotive digital isolators. Both devices are manufactured by Skyworks Solutions Inc. and carry active product status with AEC-Q100 automotive qualification.

Electrical Performance: Both parts deliver identical electrical specifications across all critical parameters including 5000Vrms isolation voltage, 150Mbps data rate, 35kV/µs common mode transient immunity, and matching propagation delay characteristics. The supply voltage range, operating temperature range, and channel configuration are identical.

Automotive Compliance: Both the SI8642ED-AS2 and SI8642BD-AS meet automotive grade requirements and AEC-Q100 qualification standards, ensuring compliance with automotive industry reliability and quality standards.

Package Compatibility: Both devices use the 16-SOIC (0.295", 7.50mm Width) surface mount package, enabling direct PCB footprint compatibility and eliminating layout redesign requirements.

Moisture Sensitivity: The SI8642ED-AS2 carries MSL 3 (168 Hours) rating, while the SI8642BD-AS carries MSL 2A (4 Weeks) rating. The MSL 2A rating of the substitute part indicates lower moisture absorption and longer shelf life under controlled storage conditions.

Supply Chain Availability: The SI8642BD-AS currently has 1398 pieces in inventory compared to 897 pieces for the SI8642ED-AS2, providing enhanced supply chain flexibility.

Selection between these two parts should be based on inventory availability, delivery timeline requirements, and specific moisture sensitivity level requirements for your manufacturing environment.

Frequently Asked Questions (FAQ)

Q: Can the SI8642BD-AS be used as a direct replacement for the SI8642ED-AS2 in automotive applications?

A: Yes. The SI8642BD-AS is a parametric equivalent substitute that meets all electrical, thermal, and automotive qualification requirements of the SI8642ED-AS2. Both devices carry AEC-Q100 qualification and identical electrical specifications. Direct PCB footprint compatibility is maintained through the identical 16-SOIC package.

Q: What is the difference between MSL 3 and MSL 2A ratings?

A: MSL (Moisture Sensitivity Level) indicates the maximum time a component can be stored in a controlled environment before moisture absorption becomes a concern. MSL 3 allows 168 hours of storage, while MSL 2A allows 4 weeks. The SI8642BD-AS with MSL 2A rating has lower moisture absorption characteristics and longer shelf life under controlled storage conditions.

Q: Are the propagation delay and timing specifications identical between these two parts?

A: Yes. Both the SI8642ED-AS2 and SI8642BD-AS have identical propagation delay specifications (13ns maximum for both tpLH and tpHL), pulse width distortion (4.5ns maximum), and rise/fall times (2.5ns typical). Signal integrity performance is equivalent.

Q: Do both parts support the same supply voltage range?

A: Yes. Both the SI8642ED-AS2 and SI8642BD-AS operate across the identical supply voltage range of 2.375V to 5.5V, ensuring compatibility with standard automotive power supply architectures.

Q: Is the 16-SOIC package footprint identical for both parts?

A: Yes. Both devices use the 16-SOIC (0.295", 7.50mm Width) surface mount package. PCB layout and footprint design remain unchanged when substituting between these parts.

Q: What is the isolation voltage rating for both parts?

A: Both the SI8642ED-AS2 and SI8642BD-AS provide 5000Vrms galvanic isolation, meeting automotive safety and regulatory requirements for high-voltage isolation applications.

Q: Are both parts qualified for the full automotive temperature range?

A: Yes. Both devices are rated for operation across -40°C to 125°C, covering the full automotive operating temperature range including cold start and high-temperature engine compartment conditions.

Q: What is the common mode transient immunity specification?

A: Both parts deliver 35kV/µs common mode transient immunity (CMTI), ensuring robust operation in automotive environments with high-speed switching and electromagnetic noise.