SI8920BC-AP Equivalent & Substitute Parts

Part Overview

The SI8920BC-AP is an automotive-grade isolation IC designed for inverters, power supplies, and uninterruptible power supply (UPS) applications. Manufactured by Skyworks Solutions Inc., this component features an 8-DIP Gull Wing package configuration and meets AEC-Q100 automotive qualification standards. The SI8920BC-AP is classified as "Not For New Designs," indicating that alternative solutions should be evaluated for new development projects. Substitute parts are available that maintain functional equivalence while offering improved product status and updated packaging options.

Substiute Parts

SI8920BC-AP

Skyworks Solutions Inc.In Stock: 1141SI8920BC-AP Datasheet

Current PartRFQ

SI8921AD-AS4

Skyworks Solutions Inc.In Stock: 1000SI8921AD-AS4 Datasheet

MFR RecommendedRFQ

SI8921BD-AS4

Skyworks Solutions Inc.In Stock: 1159SI8921BD-AS4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SI8920BC-AP are selected based on functional equivalence within the isolation IC category for automotive applications. The primary substitutes—SI8921AD-AS4 and SI8921BD-AS4—maintain the following critical parameters:

Substitution Criteria:

• Manufacturer: Skyworks Solutions Inc. (same manufacturer ensures design compatibility)
• Type: Isolation IC (identical functional classification)
• Applications: Inverters, Power Supplies, UPS (same application domain)
• Grade: Automotive (maintains automotive-grade specification)
• Qualification: AEC-Q100 (equivalent automotive qualification standard)
• Mounting Type: Surface Mount (compatible assembly process)
• Category: Linear, Amplifiers (same functional category)

Key Difference: The substitute parts utilize an 8-SOIC package instead of the 8-DIP Gull Wing package. Both package types are surface-mount configurations with eight pins, providing functional equivalence with different physical footprints. The SI8921AD-AS4 and SI8921BD-AS4 are classified as "Active" products, making them suitable for new design implementations.

Parameter Comparison

Engineering Selection Recommendations

For Existing Designs: The SI8920BC-AP remains functionally equivalent to its substitute parts for applications already in production. Continued use of the SI8920BC-AP is permissible where existing PCB layouts and assembly processes are optimized for the 8-DIP Gull Wing package.

For New Design Implementation: The SI8921AD-AS4 and SI8921BD-AS4 are the recommended selections for new automotive isolation IC applications. Both parts carry "Active" product status, ensuring long-term availability and manufacturer support. These substitutes provide improved moisture sensitivity characteristics (MSL 2A versus MSL 3), reducing handling and storage requirements during manufacturing.

Package Consideration: Selection between SI8921AD-AS4 and SI8921BD-AS4 depends on PCB layout requirements. Both utilize the 8-SOIC package format with identical electrical specifications. The transition from 8-DIP Gull Wing to 8-SOIC packaging requires PCB redesign but provides improved thermal performance and reduced board space requirements typical of SOIC configurations.

Compliance and Qualification: All three parts maintain AEC-Q100 automotive qualification, ensuring compliance with automotive industry reliability and quality standards. The substitute parts' active status provides assurance of continued manufacturing and technical support from Skyworks Solutions Inc.

Frequently Asked Questions (FAQ)

Q: Can SI8921AD-AS4 or SI8921BD-AS4 be used as direct replacements for SI8920BC-AP in existing assemblies?

A: Direct replacement requires PCB layout modification. The SI8920BC-AP uses an 8-DIP Gull Wing package, while the substitute parts use an 8-SOIC package. Pin configurations differ, necessitating PCB redesign. Electrical functionality remains equivalent across all three parts.

Q: What is the difference between SI8921AD-AS4 and SI8921BD-AS4?

A: Both parts share identical package specifications (8-SOIC), electrical classification, and automotive qualification. The designation difference reflects Skyworks Solutions Inc. internal part numbering. Selection between these two parts should be based on specific design requirements or supplier availability.

Q: Why is the SI8920BC-AP marked "Not For New Designs"?

A: This designation indicates that Skyworks Solutions Inc. recommends using alternative parts for new development projects. The SI8921AD-AS4 and SI8921BD-AS4 represent the current active product line for this functional category and are preferred for new automotive isolation IC applications.

Q: What does MSL 3 versus MSL 2A mean for component handling?

A: MSL (Moisture Sensitivity Level) indicates the maximum time a component can be exposed to ambient conditions before soldering. MSL 3 allows 168 hours of exposure, while MSL 2A allows 4 weeks. The substitute parts' improved MSL 2A rating reduces moisture-related handling constraints during manufacturing and assembly processes.

Q: Are all three parts qualified for automotive applications?

A: Yes. The SI8920BC-AP, SI8921AD-AS4, and SI8921BD-AS4 all carry AEC-Q100 automotive qualification, meeting automotive industry reliability and quality standards for isolation IC components.

Q: What is the primary reason to transition from SI8920BC-AP to the substitute parts?

A: The substitute parts offer active product status, ensuring continued manufacturer support and long-term availability. For new designs, this provides supply chain stability and access to current manufacturing processes. The improved MSL rating also reduces production handling requirements.