SI8921AB-AS

Special Purpose Amplifiers Overview

The Skyworks SI8921AB-AS is an automotive-grade, galvanically isolated analog amplifier designed for current shunt measurement. It features a specified linear differential input range of ±62.5 mV and provides a differential output amplified by a gain of 32.8x. The device utilizes proprietary CMOS isolation technology to support up to 5.0 kVRMS withstand voltage per UL1577. Key electrical characteristics include a typical signal delay of 0.8 µs, high common-mode transient immunity of 75 kV/µs, and low offset drift of 0.5 µV/°C. It operates within a temperature range of –40 °C to +125 °C and is housed in an 8-pin narrow body SOIC package.

Special Purpose Amplifiers Feature Summary

• Automotive-grade qualification with AEC-Q100 certification and AIAG-compliant PPAP documentation support.
• Galvanic isolation using CMOS technology supporting up to 5.0 kVRMS withstand voltage.
• Low signal delay of 0.8 µs and high common-mode transient immunity of 75 kV/µs.
• Differential output configuration with a fixed gain of 32.8x for the ±62.5 mV input variant.

Special Purpose Amplifiers Applications

• Industrial inverters
• High-voltage electric vehicle (HEV) inverters
• Renewable energy inverters
• AC, brushless, and DC motor controls and drives
• Automotive onboard chargers and battery management systems

Special Purpose Amplifiers Procurement Notes

Verify that the specific ordering suffix matches the required package type and insulation rating. Confirm automotive grade requirements including PPAP documentation availability if applicable. Check moisture sensitivity level compliance for assembly processes. Ensure supply chain sources provide valid certificates of conformance for RoHS and safety regulatory approvals.

Special Purpose Amplifiers Selection Notes

Select the SI8921AB-AS when a differential output is required for the ±62.5 mV input range. Compare against the SI8922 series if a single-ended output is preferred. Consider the SI8921BB variant if a wider ±250 mV input range is necessary. Verify package constraints between narrow body SOIC and wide body stretched SOIC options based on clearance and creepage requirements.

Special Purpose Amplifiers Part Context

The SI8921AB-AS belongs to the Si8921/Si8922 family of isolated amplifiers from Skyworks Solutions. This family addresses the need for accurate current sensing in high-noise environments where galvanic isolation is critical. The Si8921 variants specifically provide differential outputs, distinguishing them from the single-ended Si8922 counterparts, while sharing the same underlying isolation architecture and performance metrics.

Special Purpose Amplifiers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.