INA241B5QDDFRQ1

Overview

The INA241B5QDDFRQ1 is an AEC-Q100 qualified, bidirectional current sense amplifier from Texas Instruments. It measures voltage drops across shunt resistors over a wide common-mode range of -5V to 110V, independent of the supply voltage. The device features a fixed gain of 200 V/V and operates on a supply voltage between 2.7V and 20V with a typical quiescent current of 2.5mA. Key electrical specifications include a maximum gain error of ±0.1%, a maximum offset voltage of ±150µV, and a typical DC CMRR of 130dB. It supports switching frequencies up to 125kHz.

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 current flow in both directions across the sensing resistor.
• Wide common-mode input range enables high-side, low-side, and inline current sensing applications without being limited by the supply voltage.

Applications

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

Procurement Notes

Verify that the specific B5 suffix corresponds to the required 200 V/V gain configuration for your design. Confirm the DDF package variant matches your PCB footprint requirements. Ensure the component meets the AEC-Q100 Grade 1 qualification standards necessary for automotive deployment. Cross-reference the datasheet revision date to ensure compatibility with latest functional safety documentation.

Selection Notes

Select this part when a high gain of 200 V/V is needed to amplify small shunt voltages for downstream ADCs. The B-grade accuracy is suitable for general automotive control loops where ultra-precision is not critical. Consider the 1.1MHz bandwidth for fast transient detection. Verify that the 130dB CMRR is sufficient for the noise environment of the switching system.

Part Context

This component 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 and gain error tolerances compared to the 'A' version. The 'Q1' suffix confirms its qualification for automotive applications under AEC-Q100 standards.

Replacement Considerations

INA241B5QDGKRQ1: Same electrical specifications but housed in a VSSOP-8 package instead of SOT-23-8. Requires PCB layout adaptation.

FAQ

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

The enhanced PWM rejection feature supports switching frequencies up to 125kHz.

How does the common-mode voltage range relate to the supply voltage?

The operational common-mode range of -5V to 110V is independent of the supply voltage, which only needs to be between 2.7V and 20V.