SI8922AB-AS

Special Purpose Amplifiers Overview

The SI8922AB-AS is an automotive-grade, galvanically isolated analog amplifier designed for current shunt measurement. It features a single-ended output and a specified linear input range of ±250 mV. The device utilizes CMOS isolation technology to provide high common-mode transient immunity and low signal delay. It operates within a temperature range of -40 °C to +125 °C and supports up to 5.0 kVRMS withstand voltage per UL1577.

Special Purpose Amplifiers Feature Summary

• Automotive-grade qualification with AEC-Q100 certification
• Galvanic isolation using proprietary CMOS technology
• Low-voltage differential input optimized for shunt resistors
• Fail-safe output mode upon loss of input supply

Special Purpose Amplifiers Applications

• Automotive onboard chargers
• Battery management systems
• Charging stations
• Industrial inverters
• Motor control drives

Special Purpose Amplifiers Procurement Notes

Verify the specific suffix 'AS' indicates automotive grade compliance and narrow body SOIC packaging. Confirm that the component meets AIAG-compliant PPAP documentation requirements if mandated by your manufacturing process. Ensure the ordering part number matches the exact insulation rating and input range specifications required for your circuit design.

Special Purpose Amplifiers Selection Notes

Select this component when a single-ended output is required for isolated current sensing in automotive environments. The ±250 mV input range accommodates higher resistance shunts compared to lower-range variants. Verify that the system requires the specific 5.0 kVRMS insulation rating provided by the AS suffix variant.

Special Purpose Amplifiers Part Context

This device belongs to the Si8922 series of isolated amplifiers from Skyworks Solutions. It shares the same functional architecture as the Si8921 but provides a single-ended output instead of a differential one. The 'B' designation specifies the ±250 mV input range, while 'AS' denotes the automotive grade and package type.

Special Purpose Amplifiers Replacement Considerations

SI8922BB-IS

Special Purpose Amplifiers FAQ

What is the fail-safe output voltage when VDDA is removed?

When the high-voltage-side supply voltage (VDDA) is removed, the SI8922AB-AS enters a fail-safe mode with a nominal output voltage of approximately +2.8 V.

How does the CMOS isolation technology benefit performance?

The proprietary CMOS isolation technology enables high performance, reduced variation with temperature and age, tighter part-to-part matching, and longer lifetimes compared to other isolation technologies.