INA241A1IDDFR

Overview

The INA241A1IDDFR is a bidirectional ultra-precise current sense amplifier from Texas Instruments. It features a wide common-mode voltage range of -5V to 110V and operates on a single supply voltage between 2.7V and 20V. The device provides a fixed gain of 10V/V with a maximum gain error of ±0.01% and an input offset voltage of ±5µV. It includes enhanced PWM rejection optimized for switching frequencies up to 125kHz, ensuring minimal signal disturbance during common-mode transitions. Key electrical specifications include a small-signal bandwidth of 1.1MHz, a slew rate of 8V/µs, and a quiescent current of 2.5mA.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output disturbances caused by large common-mode voltage transients in high-frequency switching systems.
• Ultra-precision architecture delivers low input offset voltage and minimal gain drift across the full operating temperature range.
• Bidirectional operation allows accurate measurement of voltage drops across shunt resistors independent of the power supply voltage.

Applications

• Motor drives
• Solenoids and actuators
• Injection molding machines
• Cordless power tools

Procurement Notes

Verify the specific suffix IDDFR corresponds to the SOT-23-8 package and tape-and-reel shipping configuration. Confirm that the A1 variant matches the required 10V/V gain specification for your design. Ensure compatibility with the system's common-mode voltage levels and supply constraints before finalizing procurement.

Selection Notes

Select this component when high accuracy is required in environments with significant common-mode noise or fast switching edges. The 10V/V gain is suitable for applications requiring moderate amplification of low-side or high-side shunt voltages. Consider the thermal resistance characteristics of the SOT-23-8 package if operating near maximum ambient temperatures.

Part Context

This device belongs to the INA241x family of current sense amplifiers designed for high-voltage, bidirectional measurements. The INA241A1 variant specifically offers the highest precision within the series with a 10V/V gain. It complements other variants like the INA241B1 which offer slightly lower precision but similar functionality, providing designers with options based on cost and performance requirements.

Replacement Considerations

INA241B1IDDFR: Offers identical pinout and functionality with a higher maximum gain error of ±0.1% and offset voltage of ±150µV.

FAQ

How does the INA241A1 handle common-mode voltage transients?

It utilizes enhanced PWM rejection circuitry that holds the output for 1µs during large common-mode transients, preventing signal propagation to the output.

What is the maximum operating supply voltage?

The device operates with a supply voltage range from 2.7V to 20V.