INA241A1IDR

Overview

The INA241A1IDR is a bidirectional ultra-precise current sense amplifier from Texas Instruments, housed in an SOIC-8 package. It features a fixed gain of 10 V/V and operates with a supply voltage range of 2.7V to 20V. The device supports a wide common-mode input voltage range from -5V to 110V, independent of the supply voltage. Key electrical specifications include a maximum offset voltage of ±20µV, a typical DC CMRR of 166dB, and a small-signal bandwidth of 1.1MHz across all gains. It draws a quiescent current of 2.5mA and functions within an ambient temperature range of -40°C to +125°C.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance caused by large common-mode voltage transients at the inputs.
• Zero-drift architecture ensures low offset voltage and drift for accurate measurement of low shunt voltages over the full operating temperature range.
• Constant input bias current remains stable regardless of the common-mode voltage level, enabling precision sensing in high-voltage applications.

Applications

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

Procurement Notes

Verify the specific suffix IDR corresponds to the SOIC-8 tape and reel packaging configuration required for automated assembly processes. Confirm that the A1 variant matches the system design requirement for a fixed 10 V/V gain setting. Ensure environmental compliance documentation aligns with project specifications before finalizing procurement orders.

Selection Notes

Select this component when a fixed 10 V/V gain is optimal for the target current range and shunt resistor value. The ultra-precise A version offers superior accuracy compared to B versions, making it suitable for applications demanding minimal gain error and offset voltage. Consider the SOIC-8 package dimensions if board space constraints favor surface-mount technology over smaller alternatives like SOT-23 or VSSOP.

Part Context

This device belongs to the INA241x family of ultra-precise, bidirectional current sense amplifiers designed for high-side, inline, and low-side measurements. The family shares core architectural features such as enhanced PWM rejection and wide common-mode voltage tolerance. Variants differ primarily in fixed gain options (10V/V to 200V/V) and accuracy grades (A vs. B), allowing designers to optimize for specific dynamic range and precision requirements.

Replacement Considerations

INA241B1IDR provides similar functionality but with lower precision specifications. INA241A2IDR offers a different fixed gain of 20 V/V while maintaining the same accuracy grade and package type.