SI8642ET-AS Equivalent & Substitute Parts

Part Overview

The SI8642ET-AS is an automotive-grade general purpose digital isolator manufactured by Skyworks Solutions Inc. This device provides 5000Vrms isolation across 4 channels with a data rate of 150Mbps and 35kV/µs common mode transient immunity. The part is qualified to AEC-Q100 automotive standards and operates across the extended temperature range of -40°C to 125°C. The SI8642ET-AS is currently in active production status with 765 units available in stock.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the same product family, ensuring functional interchangeability in automotive applications without design modification.

Substiute Parts

SI8642ET-AS

Skyworks Solutions Inc.In Stock: 777SI8642ET-AS Datasheet

Current PartRFQ

SI8642BD-AS

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of digital isolators within the SI864x series is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Isolation voltage rating: 5000Vrms
• Channel count: 4 channels
• Data rate: 150Mbps
• Common mode transient immunity: 35kV/µs minimum
• Propagation delay specifications: 13ns maximum (both rising and falling edges)
• Pulse width distortion: 4.5ns maximum
• Supply voltage range: 2.375V to 5.5V

Mechanical & Compliance Equivalence Criteria:

• Package type: 16-SOIC (0.295", 7.50mm Width)
• Mounting type: Surface Mount
• Automotive qualification: AEC-Q100
• Operating temperature range: -40°C to 125°C
• Moisture sensitivity level: 2A (4 Weeks)

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

Parameter Comparison

Engineering Selection Recommendations

Both the SI8642ET-AS and SI8642BD-AS are active production parts manufactured by Skyworks Solutions Inc. within the Si864x digital isolator family. Both devices carry identical electrical specifications, mechanical packaging, and automotive compliance certifications.

Selection Basis:

The SI8642BD-AS provides equivalent functionality to the SI8642ET-AS with no electrical or mechanical trade-offs. Both parts satisfy AEC-Q100 automotive qualification requirements and operate across the full -40°C to 125°C temperature range. The 16-SOIC package footprint is identical, permitting direct PCB layout compatibility.

Inventory availability differs between the two parts. The SI8642BD-AS currently maintains higher stock levels (1398 units) compared to the SI8642ET-AS (765 units), which may influence procurement decisions based on lead time and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can the SI8642BD-AS be used as a direct replacement for the SI8642ET-AS in automotive applications?

A: Yes. Both parts are electrically and mechanically equivalent across all specified parameters. The SI8642BD-AS meets identical isolation voltage (5000Vrms), channel configuration (4 channels), data rate (150Mbps), common mode transient immunity (35kV/µs), propagation delay (13ns), and AEC-Q100 automotive qualification requirements. No circuit design modifications are required.

Q: Are the package dimensions identical between these two parts?

A: Yes. Both the SI8642ET-AS and SI8642BD-AS use the 16-SOIC (0.295", 7.50mm Width) surface mount package. PCB footprints, land patterns, and mounting procedures are identical.

Q: Do both parts operate across the same temperature range?

A: Yes. Both parts are rated for -40°C to 125°C operating temperature, meeting automotive extended temperature specifications.

Q: What is the significance of the different part number suffixes (ET-AS vs. BD-AS)?

A: The suffix designations reflect internal Skyworks Solutions manufacturing or packaging variants within the same Si864x product family. All specified electrical and mechanical parameters remain equivalent between the two part numbers.

Q: Are there any supply voltage differences between these parts?

A: No. Both parts operate across the identical supply voltage range of 2.375V to 5.5V.

Q: Which part should be selected based on current availability?

A: The SI8642BD-AS currently maintains higher inventory (1398 units) compared to the SI8642ET-AS (765 units). Selection may be influenced by procurement lead time requirements and supply chain planning.

Q: Do both parts carry the same moisture sensitivity rating?

A: Yes. Both parts are rated MSL 2A (4 Weeks), requiring identical handling and storage procedures.