SI8663BD-AS Equivalent & Substitute Parts

Part Overview

The SI8663BD-AS is an automotive-grade general purpose digital isolator manufactured by Skyworks Solutions Inc. This device provides galvanic isolation across 6 channels with 5000Vrms isolation voltage, operating at data rates up to 150Mbps. The part is qualified to AEC-Q100 automotive standards and utilizes capacitive coupling technology for signal isolation. The SI8663BD-AS is currently in active production status with 1117 units in stock.

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

Substiute Parts

SI8663BD-AS

Skyworks Solutions Inc.In Stock: 1172SI8663BD-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 based on the following substitution criteria:

Matching Parameters (Substitution Basis):

• Isolation voltage: 5000Vrms (identical)
• Data rate: 150Mbps (identical)
• Common mode transient immunity: 35kV/µs (identical)
• Package type: 16-SOIC (0.295", 7.50mm Width) (identical)
• Supply voltage range: 2.375V – 5.5V (identical)
• Operating temperature range: -40°C to 125°C (identical)
• Automotive grade and AEC-Q100 qualification (identical)
• Capacitive coupling technology (identical)
• Propagation delay and rise/fall time specifications (identical)

Differentiating Parameter:

• Channel count: SI8663BD-AS provides 6 channels (3 forward, 3 reverse); SI8642BD-AS provides 4 channels (2 forward, 2 reverse)

The SI8642BD-AS substitution is valid only when circuit design requirements permit operation with reduced channel count. Both devices share identical electrical performance characteristics, thermal specifications, and automotive compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

SI8663BD-AS Selection Criteria:

• Applications requiring 6-channel isolation architecture
• Designs utilizing 3 independent forward and 3 independent reverse signal paths
• Primary sourcing when full channel capacity is specified in system requirements

SI8642BD-AS Selection Criteria:

• Applications requiring 4-channel isolation architecture
• Designs utilizing 2 independent forward and 2 independent reverse signal paths
• Alternative sourcing when circuit topology permits reduced channel count
• Inventory availability considerations when SI8663BD-AS stock is constrained

Compliance Basis for Substitution: Both devices maintain identical automotive qualification status (AEC-Q100) and operate within the same electrical performance envelope. The substitution decision is determined solely by channel count requirements and circuit architecture compatibility. No additional testing or verification is required when channel count requirements are satisfied.

Frequently Asked Questions (FAQ)

Q: Can SI8642BD-AS replace SI8663BD-AS in all applications?

A: No. The SI8642BD-AS provides 4 channels versus the 6 channels of the SI8663BD-AS. Substitution is valid only when the circuit design requires 4 or fewer isolation channels. If the application requires all 6 channels, the SI8663BD-AS must be used.

Q: Are the electrical performance characteristics identical between these parts?

A: Yes. Both devices share identical isolation voltage (5000Vrms), data rate (150Mbps), common mode transient immunity (35kV/µs), propagation delay (13ns), and supply voltage specifications. The only difference is channel count.

Q: Do both parts have the same package footprint?

A: Yes. Both SI8663BD-AS and SI8642BD-AS use the 16-SOIC (0.295", 7.50mm Width) package. PCB layout compatibility is maintained between the two parts.

Q: Are both parts automotive qualified?

A: Yes. Both devices carry automotive grade designation and AEC-Q100 qualification. They are suitable for automotive applications within the specified operating temperature range of -40°C to 125°C.

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

A: Both parts have MSL 2A rating with a 4-week floor life. Identical moisture handling procedures apply to both devices.

Q: Can I use SI8663BD-AS in place of SI8642BD-AS?

A: Yes. The SI8663BD-AS can be used in applications designed for the SI8642BD-AS, as it provides additional channels. However, this may result in unused channels and increased component cost. Circuit design must accommodate the additional channels.

Q: What is the base product number for each part?

A: SI8663BD-AS has base product number SI8663. SI8642BD-AS has base product number SI8642. The "-BD-AS" suffix indicates the specific automotive-grade packaging variant.