INA241B2QDRQ1

Overview

The INA241B2QDRQ1 is an AEC-Q100 qualified, bidirectional current-sense amplifier with a fixed gain of 20 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 ±0.1%, a typical DC CMRR of 130dB, and a small-signal bandwidth of 1.1MHz at all gains. The device features enhanced PWM rejection for switching systems and is housed in an SOIC-8 package.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance caused by large common-mode voltage transients associated with switching frequencies up to 125kHz.
• Bidirectional operation allows accurate measurement of voltage drops across shunt resistors independent of the power supply voltage.
• High precision achieved through low offset voltage and minimal gain error drift across the specified temperature range.

Applications

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

Procurement Notes

Verify the specific suffix 'QDRQ1' corresponds to the automotive-grade qualification and SOIC-8 package configuration. Confirm that the B-series accuracy parameters meet the system requirements for gain error and offset voltage. Ensure the design accounts for the functional safety documentation if utilized in safety-critical applications.

Selection Notes

Select this component when high-side or low-side sensing is required within a wide common-mode range exceeding the supply voltage. The 20V/V gain is suitable for applications requiring moderate amplification of small shunt voltages. Consider the thermal resistance metrics for PCB layout optimization to ensure reliable operation under maximum load conditions.

Part Context

This part belongs to the INA241x-Q1 family of ultra-precise current sense amplifiers designed for automotive environments. The 'B' designation indicates a specific accuracy grade with higher offset voltage limits compared to the 'A' version, while maintaining the same bandwidth and common-mode capabilities. The 'Q1' suffix denotes AEC-Q100 certification for automotive reliability.

Replacement Considerations

INA241B2IDRQ1

FAQ

How does the device handle common-mode voltage transients?

The INA241B2QDRQ1 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 operating common-mode voltage?

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