AMC3302QDWERQ1

Overview

The AMC3302QDWERQ1 is an automotive-grade, high-precision isolated amplifier featuring a fixed gain of 41 V/V and a ±50-mV input voltage range optimized for shunt-based current sensing. It incorporates an integrated isolated DC/DC converter enabling single-supply operation from 3.3 V or 5 V on the low side. The device provides reinforced isolation certified to DIN VDE V 0884-11 (6000-VPK) and UL 1577 (4250-VRMS), with a working voltage up to 1.2 kVRMS. Key electrical characteristics include a maximum offset voltage of ±50 µV, a common-mode transient immunity of 95 kV/µs, and an output bandwidth of 340 kHz.

Feature Summary

• Integrated isolated DC/DC converter allows single-supply operation from the low-side power rail
• Reinforced capacitive isolation barrier certified per DIN VDE V 0884-11 and UL 1577 standards
• System-level diagnostic features including DC/DC fault detection and active-low open-drain status indicator
• Optimized for direct connection to low-impedance shunt resistors with excellent DC accuracy

Applications

• Shunt-resistor-based current sensing in HEV/EV charging piles
• Current measurement in HEV/EV on-board chargers (OBC)
• Current sensing in HEV/EV DC/DC converters
• Current monitoring in HEV/EV traction inverters

Procurement Notes

Verify that the specific part number AMC3302QDWERQ1 matches the required AEC-Q100 Grade 1 qualification and SOIC-16 package configuration. Confirm that the design utilizes the internal isolated DC/DC converter correctly by connecting LDO_OUT to DCDC_IN and DCDC_OUT to HLDO_IN as specified in the datasheet pinout. Ensure compliance with the recommended PCB layout guidelines to maintain the required creepage and clearance distances for reinforced isolation safety ratings.

Selection Notes

Select this component when space-constrained designs require a fully integrated isolated amplifier without external magnetics. It is suitable for applications demanding high precision with low offset drift over the -40°C to +125°C temperature range. The fixed gain of 41 V/V and ±50-mV input range are specifically tailored for standard shunt resistor values in high-current automotive environments. Consider the integrated diagnostics if system-level fault detection is required.

Part Context

The AMC3302-Q1 belongs to Texas Instruments' AMC330x family of high-precision isolated amplifiers designed for automotive current sensing. Unlike optocoupler-based solutions, it uses reinforced capacitive isolation technology. The Q1 suffix denotes automotive qualification under AEC-Q100 standards, ensuring reliability in harsh vehicle environments. This specific variant includes the integrated DC/DC converter, distinguishing it from non-isolated power variants within the broader product line.

Replacement Considerations

AMC3302DWRE4