INA241A3QDGKRQ1

Overview

The INA241A3QDGKRQ1 is an ultra-precise, 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 gain of 50 V/V, a maximum offset voltage of ±10µV, and a typical DC CMRR of 166dB. It operates with a supply voltage between 2.7V and 20V, drawing 2.5mA of quiescent current. The component supports switching frequencies up to 125kHz and includes enhanced PWM rejection circuitry.

Feature Summary

• Enhanced PWM rejection minimizes signal disturbance at the output due to large common-mode voltage transitions at the inputs.
• Ultra-precision architecture achieves high accuracy through low offset voltage and minimal gain error.
• Bidirectional operation allows for accurate measurement of current flow in both directions.
• Wide common-mode input range enables functionality independent of the power supply voltage.

Applications

• Electric turbocharger or charger systems
• Electric power steering (EPS)
• Starter/generator applications
• Regenerative braking systems
• Brake system monitoring

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm AEC-Q100 qualification status if automotive compliance is mandatory. Ensure the selected gain version aligns with the target full-scale output voltage requirements. Cross-reference the datasheet revision date to confirm the availability of functional safety documentation.

Selection Notes

Select this component when high precision is required in switching systems subject to large common-mode transients. The 50 V/V gain option optimizes the dynamic range for specific shunt resistor values. Consider the 1.1MHz bandwidth for rapid over-current event detection. Verify that the operating temperature range meets the specific application environment constraints.

Part Context

This part belongs to the INA241x-Q1 family of ultra-precise current sense amplifiers designed for automotive applications. It shares core architectural features with other gain variants within the series, such as the INA241A1-Q1 and INA241A5-Q1. The primary distinction lies in the fixed internal gain setting, which determines the scaling factor for the output voltage relative to the input differential signal.

Replacement Considerations

INA241A1QDGKRQ1

FAQ

How does the device handle large common-mode voltage transients?

The INA241A3QDGKRQ1 utilizes enhanced PWM rejection circuitry to attenuate large common-mode ΔV/Δt transients. This feature holds the output for 1μs during significant transitions, preventing disturbances from propagating to the output signal.

What is the operational common-mode voltage range?

The device supports an operational common-mode voltage range from -5V to 110V. This range is independent of the power supply voltage, allowing for high-side, low-side, and inline sensing configurations.