INA241B4QDRQ1

Overview

The INA241B4QDRQ1 is an AEC-Q100 qualified, bidirectional current sense amplifier with a fixed gain of 100 V/V. It operates over a common-mode voltage range of -5V to 110V and supports supply voltages from 2.7V to 20V. The device features enhanced PWM rejection for switching systems up to 125kHz, a small-signal bandwidth of 1.1MHz, and a slew rate of 8V/µs. Electrical characteristics include a maximum gain error of ±0.1%, input offset voltage of ±150µV, and DC CMRR of 130dB. It is housed in an SOT-23-8 package.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance caused by large common-mode voltage transients at the inputs.
• Bidirectional operation allows accurate measurement of voltage drops across shunt resistors independent of the power supply voltage.
• High small-signal bandwidth ensures fast response times required for rapid detection and processing of over-current events.

Applications

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

Procurement Notes

Verify the specific suffix 'QDRQ1' against the manufacturer's official ordering database to confirm the exact package type, temperature grade, and reel specifications. Ensure the component meets the functional safety documentation requirements if utilized in safety-critical automotive designs. Cross-reference the datasheet revision date to validate all electrical parameters before final integration.

Selection Notes

Select this part when a fixed 100 V/V gain is required for high-side or low-side sensing within a wide common-mode range. The B-version offers a balance of precision and cost compared to the A-version. Consider the SOT-23-8 package constraints for thermal management and board space. Verify that the 1.1MHz bandwidth aligns with the system's transient response needs.

Part Context

This component belongs to the INA241x-Q1 family of ultra-precise current sense amplifiers designed for automotive applications. The family provides multiple gain options ranging from 10 V/V to 200 V/V. The Q1 designation indicates qualification under the AEC-Q100 standard for automotive-grade reliability and performance across specified temperature ranges.

Replacement Considerations

INA241A4QDRQ1: Offers higher precision with lower gain error and offset voltage but may have different thermal characteristics.

FAQ

How does the device handle common-mode voltage transients?

The INA241B4QDRQ1 utilizes enhanced PWM rejection circuitry that holds the output for 1µs during large common-mode transients, preventing disturbances from propagating to the output signal.

What is the maximum operating supply voltage?

The recommended operating supply voltage range is from 2.7V to 20V.