INA240A2QPWRQ1

Overview

The INA240A2QPWRQ1 is a zero-drift current-sense amplifier with a fixed gain of 50 V/V. It operates within a supply voltage range of 2.7 V to 5.5 V and supports bidirectional sensing across a common-mode voltage range of -4 V to 80 V. Key electrical specifications include an input offset voltage of 5 µV, input bias current of 90 µA, and a -3 dB bandwidth of 400 kHz. The device achieves a common-mode rejection ratio (CMRR) of 132 dB and maintains a gain error of 0.05%. It functions reliably in temperatures from -40°C to +125°C and is housed in an 8-pin SOIC package.

Feature Summary

• Enhanced PWM suppression for high-level inhibition against high common-mode transients in pulse-width modulation systems
• Zero-drift architecture ensuring ultra-precision without external trimming or calibration requirements
• Bidirectional current sensing capability allowing operation below ground potential for flyback periods

Applications

• Automotive electronic control units requiring AEC-Q100 qualified components
• High-side current monitoring in solenoid and motor drive circuits
• Industrial power management systems utilizing pulse-width modulation signals

Procurement Notes

Verify the specific suffix Q1 confirms automotive qualification status per manufacturer documentation. Confirm the PWR designation corresponds to the correct surface-mount package variant. Ensure compatibility with system voltage rails and thermal constraints before integration. Cross-reference datasheet revisions for any marking or design changes that may affect pinout or functionality.

Selection Notes

Select this component when precise current measurement is required in noisy environments with high common-mode voltages. The fixed 50 V/V gain simplifies signal conditioning for downstream analog-to-digital converters. Consider the wide common-mode range for applications where the sense resistor is placed on the high side of the load. Verify that the 400 kHz bandwidth meets the dynamic response requirements of the target application.

Part Context

This part belongs to the INA240 family of zero-drift current-sense amplifiers designed for high-accuracy applications. The Q1 suffix indicates compliance with automotive reliability standards, distinguishing it from commercial variants. It shares architectural similarities with other high-side sensors but offers specific enhancements for transient immunity and low-frequency accuracy essential for modern power electronics.

Replacement Considerations

Direct substitutes include other AEC-Q100 qualified current-sense amplifiers with similar gain and common-mode ranges. Verify pin compatibility and thermal performance when replacing with devices from different manufacturers. Ensure that alternative parts maintain the required PWM suppression capabilities if used in switching applications.