SI8642ED-AS Equivalent & Substitute Parts

Part Overview

The SI8642ED-AS is a general-purpose digital isolator manufactured by Skyworks Solutions Inc., designed for automotive applications requiring galvanic isolation. This device provides 5000Vrms isolation across four channels with a maximum data rate of 150Mbps and operates across a supply voltage range of 2.375V to 5.5V. The part is qualified to AEC-Q100 automotive standards and maintains active product status with 660 units currently in stock.

Digital isolators are essential components in automotive systems where electrical isolation is required between different voltage domains, such as in battery management systems, motor control units, and CAN bus interfaces. Identifying equivalent substitute parts ensures design flexibility and supply chain continuity while maintaining system performance and reliability.

Substiute Parts

SI8642ED-AS

Skyworks Solutions Inc.In Stock: 744SI8642ED-AS Datasheet

Current PartRFQ

SI8642BD-AS

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SI8642ED-AS is determined by strict equivalence across the following critical parameters:

Isolation and Safety Requirements: Voltage isolation rating of 5000Vrms and automotive-grade qualification (AEC-Q100) are non-negotiable for applications requiring this part. Any substitute must maintain identical isolation voltage and automotive certification.

Electrical Performance: Data rate of 150Mbps, common mode transient immunity of 35kV/µs minimum, propagation delay specifications (13ns maximum for both tpLH and tpHL), and pulse width distortion of 4.5ns maximum define the signal integrity requirements. Substitutes must match these values exactly.

Power Supply Compatibility: Supply voltage range of 2.375V to 5.5V ensures compatibility with automotive power distribution systems. Substitutes must support this identical range.

Channel Configuration: Four channels with 2 inputs on Side 1 and 2 inputs on Side 2, configured as unidirectional channels, establish the functional architecture. Substitutes must replicate this exact channel topology.

Physical and Environmental Constraints: 16-SOIC package with 0.295" width (7.50mm), surface mount technology, and operating temperature range of -40°C to 125°C define the mechanical and thermal compatibility. Substitutes must use the identical package specification.

Technology Platform: Capacitive coupling technology and membership in the Si864x series establish the underlying design platform. Substitutes must employ the same isolation technology.

Parameter Comparison

Engineering Selection Recommendations

The SI8642BD-AS is a direct parametric equivalent to the SI8642ED-AS. Both parts share identical electrical specifications, package configuration, automotive qualification, and operating characteristics. The distinction between these two part numbers reflects internal Skyworks Solutions manufacturing or distribution coding rather than functional or performance differences.

Selection between SI8642ED-AS and SI8642BD-AS should be based on availability and supply chain requirements. The SI8642BD-AS currently maintains higher inventory levels (1398 units versus 660 units), which may provide supply chain advantages for high-volume production or extended lead-time mitigation. Both parts maintain active product status and AEC-Q100 qualification, ensuring continued support and reliability for automotive applications.

For applications where the SI8642ED-AS is specified, the SI8642BD-AS can be substituted without design modification, PCB layout changes, or firmware updates. No additional testing or qualification is required beyond standard incoming component inspection procedures.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts are parametrically identical across all electrical, thermal, and mechanical specifications. They share the same 5000Vrms isolation rating, 150Mbps data rate, 35kV/µs CMTI, AEC-Q100 qualification, and 16-SOIC package. No design changes are required.

Q: Are there any differences in isolation voltage or data rate between these parts?

A: No. Both SI8642ED-AS and SI8642BD-AS provide 5000Vrms isolation and support 150Mbps data rates. All signal integrity parameters, including propagation delay (13ns maximum), pulse width distortion (4.5ns maximum), and rise/fall times (2.5ns typical) are identical.

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

A: Yes. Both parts operate across 2.375V to 5.5V supply voltage range and maintain identical performance across this range. They are compatible with standard automotive power distribution systems.

Q: Is the package identical between SI8642ED-AS and SI8642BD-AS?

A: Yes. Both parts use 16-SOIC (0.295", 7.50mm Width) surface mount packaging. PCB footprints, solder reflow profiles, and placement procedures are identical. No PCB redesign is necessary when substituting between these parts.

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

A: Both SI8642ED-AS and SI8642BD-AS operate across -40°C to 125°C, meeting automotive temperature requirements. Thermal management considerations remain unchanged between the two parts.

Q: Are both parts AEC-Q100 qualified?

A: Yes. Both SI8642ED-AS and SI8642BD-AS carry AEC-Q100 automotive qualification. They meet identical reliability, quality, and testing standards required for automotive applications.

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

A: Both parts have MSL 2A rating with a 4-week floor life. Identical moisture control and storage procedures apply to both SI8642ED-AS and SI8642BD-AS.

Q: Can I mix SI8642ED-AS and SI8642BD-AS in the same production batch?

A: Yes. Since both parts are parametrically identical, they can be used interchangeably in the same design and production environment. Standard component traceability and documentation procedures should be maintained.

Q: What export classification applies to these parts?

A: Both SI8642ED-AS and SI8642BD-AS are classified under ECCN EAR99 and HTSUS 8542.39.0001, with identical export control treatment.