INA241B1QDRQ1

Overview

The INA241B1QDRQ1 is a bidirectional, ultra-precise current sense amplifier from Texas Instruments. It features a gain of 10 V/V and operates with a supply voltage between 2.7V and 20V. The device supports a wide common-mode input range from -5V to 110V. Key electrical specifications include a maximum gain error of 0.1%, an offset voltage of ±150µV, and a typical DC CMRR of 130dB. It has a small-signal bandwidth of 1.1MHz and draws 2.5mA of quiescent current. The component is housed in an SOIC-8 package and is qualified for automotive applications under AEC-Q100 standards.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance caused by large common-mode voltage transients at the inputs.
• Bidirectional operation allows for accurate measurement of voltage drops across shunt resistors regardless of current direction.
• Wide common-mode voltage range enables high-side, low-side, and inline sensing independent of the power supply voltage.

Applications

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

Procurement Notes

Verify the specific suffix 'QDRQ1' corresponds to the SOIC-8 package and reel/cut-tape packaging configuration. Confirm that the B-grade accuracy parameters meet the system requirements, as they differ from the A-grade variants. Ensure the ordering code matches the intended temperature grade and functional safety documentation availability.

Selection Notes

Select this part when a gain of 10 V/V is required for high-current applications with minimal shunt voltage drop. The B-grade version offers higher gain error and offset voltage compared to the A-grade but maintains the same bandwidth and common-mode range. Consider the SOIC-8 package for standard PCB layouts if smaller packages like SOT-23 or VSSOP are not suitable for thermal or space constraints.

Part Context

This component belongs to the INA241x-Q1 family of ultra-precise current sense amplifiers designed for automotive environments. The family includes multiple gain options ranging from 10 V/V to 200 V/V and two accuracy grades (A and B). All variants share the same enhanced PWM rejection architecture and wide common-mode input capabilities, ensuring consistent performance characteristics across different gain configurations.

Replacement Considerations

INA241A1QDRQ1: Offers superior precision with lower gain error and offset voltage while maintaining identical gain and package.

FAQ

What is the maximum switching frequency supported by the enhanced PWM rejection?

The enhanced PWM rejection is optimized for systems with switching frequencies up to 125kHz.

How does the B-grade accuracy compare to the A-grade in terms of offset voltage?

The B-grade variant has a maximum offset voltage of ±150µV, whereas the A-grade variant has a maximum offset voltage of ±10µV.