SI8921AD-IS4R

Special Purpose Amplifiers Overview

The SI8921AD-IS4R is a galvanically isolated analog amplifier from Skyworks Solutions, designed for low-voltage differential input measurement. It features a specified full-scale input range of ±62.5 mV and an internal gain of 32.8x, producing a differential output voltage with a nominal common mode of 1.4 V. The device utilizes CMOS isolation technology supporting up to 5.0 kVRMS withstand voltage per UL1577. Key electrical parameters include a typical signal delay of 0.8 µs, a bandwidth of 600 kHz, and a typical input offset voltage of ±0.04 mV. It operates on supply voltages between 3.0 V and 5.5 V.

Special Purpose Amplifiers Feature Summary

• Galvanic isolation via proprietary CMOS technology for high common-mode transient immunity
• Low-voltage differential input optimized for current shunt resistor measurements
• Fail-safe output mode activates automatically upon loss of the primary-side supply voltage
• High accuracy maintained across temperature ranges through low offset and gain drift specifications

Special Purpose Amplifiers Applications

• Industrial, HEV, and renewable energy inverters
• AC, brushless, and DC motor controls and drives
• Isolated switch mode and UPS power supplies
• Automotive onboard chargers and battery management systems

Special Purpose Amplifiers Procurement Notes

Verify the specific ordering suffix IS4R against official Skyworks documentation to confirm the package type and reel quantity. Ensure compliance with moisture sensitivity level requirements during storage and soldering processes. Cross-reference safety certifications such as UL1577 and CSA 62368-1 if required by your system design standards. Confirm that the automotive-grade status aligns with your project's qualification needs.

Special Purpose Amplifiers Selection Notes

Select this component when measuring low-voltage signals across current shunts in high-noise environments. The ±62.5 mV input range suits applications requiring high gain amplification of small differential signals. Consider the differential output topology if interfacing with a differential ADC. Evaluate the 600 kHz bandwidth against your system's switching frequency to ensure adequate signal fidelity and noise rejection capabilities.

Special Purpose Amplifiers Part Context

This part belongs to the Si8921/Si8922 family of isolated amplifiers. The 'A' designation indicates the ±62.5 mV input range variant, while 'D' specifies the 5.0 kVRMS insulation rating. The 'IS4R' suffix denotes the wide-body stretched SOIC-8 package configuration supplied in a tape and reel format for automated assembly.

Special Purpose Amplifiers Replacement Considerations

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