INA240A4QDRQ1

Overview

The INA240A4QDRQ1 is a high-side current sense amplifier from Texas Instruments, designed for automotive applications with AEC-Q100 qualification. It features a bidirectional measurement capability and operates within a common-mode voltage range of -4 V to 80 V. The device provides a fixed gain of 200 V/V and achieves a maximum gain error of 0.05%. Key electrical specifications include an input offset voltage of 5 uV, a supply current of 2.4 mA, and a 3dB bandwidth of 400 kHz. It is housed in an SOIC-8 package and supports operating temperatures from -40°C to +125°C.

Feature Summary

• Zero-drift architecture ensures ultra-low input offset voltage and minimal drift over temperature variations.
• Enhanced PWM rejection circuitry effectively suppresses large dv/dt common-mode signals typical in switching environments.
• Bidirectional operation allows accurate current sensing in both directions across a wide common-mode voltage range.

Applications

• Automotive battery management systems
• Motor control circuits
• High-side current monitoring in power distribution units

Procurement Notes

Verify the specific suffix QDRQ1 to confirm the SOIC-8 package and automotive grade classification. Ensure compatibility with your PCB footprint for the SOIC-8 form factor. Confirm that the required gain of 200 V/V aligns with your system's signal conditioning needs. Check datasheet limits for common-mode voltage and supply voltage constraints before integration.

Selection Notes

Select this component when high precision and robustness against electromagnetic interference are critical. The zero-drift technology minimizes calibration requirements compared to standard amplifiers. Consider the 80 V common-mode range for high-voltage automotive buses. Evaluate the 400 kHz bandwidth against the switching frequency of your application to ensure adequate signal fidelity without excessive noise.

Part Context

This part belongs to the INA240-Q1 family of current sense amplifiers. It shares architectural similarities with other members like the INA240A4QPWRQ1 but differs in packaging. The family is characterized by its ability to handle harsh automotive electrical environments while maintaining high accuracy in current measurement tasks.

Replacement Considerations

The INA240A4QPWRQ1 serves as a functional alternative with identical electrical characteristics but utilizes an 8-TSSOP package instead of SOIC-8. Verify pinout compatibility and thermal performance differences between the SOIC-8 and TSSOP-8 packages before substitution.