SI8920AC-IS Equivalent & Substitute Parts

Part Overview

The SI8920AC-IS is an isolation IC manufactured by Skyworks Solutions Inc., designed for inverters, power supplies, and UPS applications. This component is classified as a linear amplifier with isolation functionality and is packaged in a 16-SOIC surface mount configuration. The SI8920AC-IS carries a product status of "Not For New Designs," indicating that Skyworks Solutions Inc. has transitioned this part to end-of-life status. For new circuit designs and ongoing production requirements, equivalent substitute parts from the SI8921 series are available as active alternatives.

Substiute Parts

SI8920AC-IS

Skyworks Solutions Inc.In Stock: 1259SI8920AC-IS Datasheet

Current PartRFQ

SI8921AD-IS4

Skyworks Solutions Inc.In Stock: 2768SI8921AD-IS4 Datasheet

MFR RecommendedRFQ

SI8921BD-IS4

Skyworks Solutions Inc.In Stock: 1385SI8921BD-IS4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SI8920AC-IS are identified from the SI8921 series, which maintains functional equivalence for isolation IC applications in inverters, power supplies, and UPS systems. The substitution logic is based on the following criteria:

Functional Compatibility:

• Identical application domain (Inverters, Power Supplies, UPS)
• Same isolation IC type and category (Linear, Amplifiers)
• Equivalent surface mount technology

Compliance & Certification Alignment:

• RoHS3 compliance maintained across all substitute parts
• REACH unaffected status consistent
• EAR99 export classification retained

Key Differentiators:

• Substitute parts operate with improved moisture sensitivity (MSL 2A vs. MSL 3)
• Substitute parts feature active product status, ensuring ongoing manufacturer support
• Package configuration differs (8-SOIC vs. 16-SOIC), requiring PCB layout evaluation

The SI8921AD-IS4 and SI8921BD-IS4 are manufacturer-recommended alternatives that provide isolation functionality for the same application classes while offering enhanced reliability characteristics and active lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

For Existing Designs (SI8920AC-IS Retention): The SI8920AC-IS remains suitable for legacy system maintenance and repair applications where existing PCB layouts and component placement are fixed. Current inventory of 1,168 pieces supports ongoing production of established products. However, the "Not For New Designs" status indicates that Skyworks Solutions Inc. does not recommend this part for new circuit development.

For New Designs and Future Production: The SI8921AD-IS4 and SI8921BD-IS4 are the designated active alternatives. Both parts carry "Active" product status, ensuring continued manufacturer support, technical documentation, and supply chain availability. The transition to SI8921 series components provides improved moisture sensitivity characteristics (MSL 2A), which enhances reliability in storage and field deployment scenarios compared to the MSL 3 rating of the SI8920AC-IS.

Compliance Considerations: All three parts maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory alignment for industrial and commercial applications. Export classification remains consistent at EAR99 across the product family.

Package Transition Impact: Selection between SI8920AC-IS and SI8921 series requires evaluation of package footprint differences. The SI8920AC-IS uses 16-SOIC packaging, while substitute parts employ 8-SOIC packaging. This dimensional change necessitates PCB layout modification and revalidation of thermal and electrical performance characteristics specific to the application circuit.

Frequently Asked Questions (FAQ)

Q: Can SI8921AD-IS4 or SI8921BD-IS4 directly replace SI8920AC-IS in existing assemblies?

A: Direct replacement requires PCB layout modification. The SI8920AC-IS uses 16-SOIC packaging while substitute parts use 8-SOIC packaging. The footprint, pin count, and physical dimensions differ, necessitating circuit board redesign and component placement adjustment.

Q: What is the significance of the "Not For New Designs" status on SI8920AC-IS?

A: This designation indicates that Skyworks Solutions Inc. has classified the SI8920AC-IS as end-of-life for new product development. The manufacturer recommends SI8921 series parts for all new circuit designs. Existing inventory supports legacy product maintenance only.

Q: Are the SI8921AD-IS4 and SI8921BD-IS4 functionally identical?

A: Both parts share identical isolation IC functionality, application support (Inverters, Power Supplies, UPS), packaging (8-SOIC), and compliance certifications. Both carry active product status and improved moisture sensitivity (MSL 2A). Selection between these two variants depends on specific circuit requirements and design parameters not provided in this reference.

Q: How does the moisture sensitivity level (MSL) difference affect component handling?

A: The SI8920AC-IS carries MSL 3 (168 hours), while SI8921AD-IS4 and SI8921BD-IS4 carry MSL 2A (4 weeks). Lower MSL ratings indicate greater tolerance to moisture exposure during storage and assembly. The improved MSL 2A rating of substitute parts provides extended shelf life and reduced risk of moisture-related failures in humid environments.

Q: What compliance certifications apply to all three parts?

A: All three parts maintain RoHS3 compliance and REACH unaffected status. Export classification is consistent at EAR99 for all variants. These certifications ensure regulatory compliance for industrial, commercial, and consumer applications in regulated markets.

Q: Is inventory availability a factor in part selection?

A: Current inventory levels are SI8920AC-IS (1,168 pieces), SI8921AD-IS4 (2,709 pieces), and SI8921BD-IS4 (1,341 pieces). For new designs, the higher inventory of SI8921AD-IS4 may provide supply chain advantages. For legacy product support, SI8920AC-IS inventory supports near-term production requirements.