SI8663ED-AS Equivalent & Substitute Parts

Part Overview

The SI8663ED-AS is an automotive-grade general purpose digital isolator manufactured by Skyworks Solutions Inc. This device provides 5000Vrms isolation across 6 channels (3 forward, 3 reverse) with capacitive coupling technology, operating at 150Mbps data rate and supporting 35kV/µs common mode transient immunity. The part is qualified to AEC-Q100 automotive standards and operates across the -40°C to 125°C temperature range in a 16-SOIC surface mount package.

Substitute parts are identified when design requirements permit reduction in channel count or when inventory constraints necessitate alternative configurations while maintaining critical electrical and mechanical compatibility parameters.

Substiute Parts

SI8663ED-AS

Skyworks Solutions Inc.In Stock: 1138SI8663ED-AS Datasheet

Current PartRFQ

SI8642BD-AS

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The SI8642BD-AS is identified as a parametric equivalent substitute based on the following substitution criteria:

Matching Parameters (Substitution Basis):

• Voltage - Isolation: 5000Vrms (identical)
• Common Mode Transient Immunity: 35kV/µs (identical)
• Data Rate: 150Mbps (identical)
• Propagation Delay: 13ns / 13ns (identical)
• Pulse Width Distortion: 4.5ns (identical)
• Voltage - Supply: 2.375V ~ 5.5V (identical)
• Grade: Automotive (identical)
• Qualification: AEC-Q100 (identical)
• Operating Temperature: -40°C ~ 125°C (identical)
• Package / Case: 16-SOIC (0.295", 7.50mm Width) (identical)
• Technology: Capacitive Coupling (identical)
• Product Status: Active (identical)

Differing Parameter:

• Number of Channels: SI8642BD-AS provides 4 channels (2 forward, 2 reverse) versus 6 channels (3 forward, 3 reverse) on the SI8663ED-AS

Substitution is valid only when application requirements permit operation with reduced channel count. The SI8642BD-AS maintains all critical electrical performance characteristics, isolation ratings, timing specifications, and automotive compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

SI8663ED-AS Selection Criteria:

• Applications requiring 6-channel isolation (3 forward, 3 reverse channels)
• Designs utilizing full channel capacity of the 16-SOIC package
• Systems where all isolation channels are active in the signal path

SI8642BD-AS Selection Criteria:

• Applications requiring 4-channel isolation (2 forward, 2 reverse channels)
• Designs where channel count reduction does not impact system functionality
• Scenarios where SI8642BD-AS inventory availability is prioritized
• Cost optimization when fewer channels satisfy application requirements

Both parts maintain identical electrical performance specifications, automotive qualification status (AEC-Q100), and operating characteristics. Selection between these parts is determined solely by channel count requirements and application architecture. Both devices are Active products with established supply chains.

Frequently Asked Questions (FAQ)

Q: Can SI8642BD-AS replace SI8663ED-AS in all applications?

A: No. SI8642BD-AS provides 4 channels versus 6 channels on SI8663ED-AS. Substitution is valid only when the application requires 4 or fewer isolation channels. If the design utilizes all 6 channels of the SI8663ED-AS, SI8642BD-AS is not a suitable replacement.

Q: Are the isolation voltage ratings identical between these parts?

A: Yes. Both SI8663ED-AS and SI8642BD-AS provide 5000Vrms isolation voltage rating. Isolation performance is equivalent.

Q: Do these parts have identical timing specifications?

A: Yes. Propagation delay (13ns / 13ns), pulse width distortion (4.5ns), and rise/fall time (2.5ns / 2.5ns) are identical across both parts.

Q: Are both parts qualified for automotive applications?

A: Yes. Both SI8663ED-AS and SI8642BD-AS carry Automotive grade designation and AEC-Q100 qualification. Both operate across -40°C to 125°C temperature range.

Q: Is the package footprint identical?

A: Yes. Both parts use 16-SOIC (0.295", 7.50mm Width) surface mount package. PCB layout compatibility is maintained.

Q: What is the key difference between these parts?

A: The primary difference is channel count. SI8663ED-AS provides 6 channels (3 forward, 3 reverse), while SI8642BD-AS provides 4 channels (2 forward, 2 reverse). All other electrical and mechanical specifications are identical.

Q: Can I use SI8663ED-AS in place of SI8642BD-AS?

A: Yes. SI8663ED-AS can be used in applications designed for SI8642BD-AS, as it provides additional channels. However, this may result in unused channels and higher component cost.

Q: Do these parts have the same supply voltage range?

A: Yes. Both parts operate with supply voltage range of 2.375V to 5.5V.

Q: Are the common mode transient immunity ratings the same?

A: Yes. Both SI8663ED-AS and SI8642BD-AS support 35kV/µs common mode transient immunity (CMTI).