INA241A3QDRQ1

Overview

The INA241A3QDRQ1 is an AEC-Q100 qualified, bidirectional ultra-precise current sense amplifier with a fixed gain of 50 V/V. It operates over a common-mode voltage range of -5V to 110V and supports supply voltages from 2.7V to 20V. Key electrical specifications include a maximum gain error of ±0.002%, typical DC CMRR of 166dB, input offset voltage of ±3µV, and quiescent current of 2.5mA. The device features a 1.1MHz bandwidth, 8V/µs slew rate, and enhanced PWM rejection for switching systems.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance caused by large common-mode voltage transients at the inputs.
• Ultra-precision architecture ensures high accuracy through low offset voltage and minimal gain error across the operating temperature range.
• Bidirectional operation allows measurement of voltage drops across shunt resistors in both positive and negative directions.

Applications

• Electric power steering (EPS)
• Regenerative braking systems
• Brake system control
• Starter/generator circuits

Procurement Notes

Verify the specific suffix 'QDRQ1' corresponds to the SOIC-8 package and tape-and-reel shipping configuration. Confirm Grade 1 automotive qualification (-40°C to 125°C) matches the target application environment. Ensure functional safety documentation requirements are met if the design involves safety-critical logic.

Selection Notes

Select this component when a fixed 50 V/V gain is required for high-side or low-side sensing within a wide common-mode window. The ultra-precise version is suitable for applications demanding minimal calibration due to low offset and drift characteristics. Consider the SOIC-8 package constraints for thermal management and PCB layout space.

Part Context

This part belongs to the INA241x-Q1 family of current sense amplifiers designed for automotive environments. It shares core topology with other gains but differs in internal resistor networks setting the 50 V/V amplification factor. The Q1 designation indicates compliance with automotive reliability standards distinct from commercial variants.

Replacement Considerations

INA241A3IDWRQ1: Same gain and package, different manufacturer suffix code.

FAQ

How does the INA241A3QDRQ1 handle common-mode transients?

It utilizes enhanced PWM rejection circuitry that holds the output for 1µs during large common-mode transitions, preventing disturbances from propagating to the output signal.

What is the maximum common-mode voltage supported?

The device supports an operational common-mode voltage range from -5V to 110V, independent of the supply voltage.