INA241B4IDR

Overview

The INA241B4IDR is a bidirectional current sense amplifier from the Texas Instruments INA241B series, housed in an SOIC-8 package. It features a fixed gain of 100 V/V and supports a common-mode voltage range of -5V to 110V with a supply voltage range of 2.7V to 20V. Key electrical specifications include a maximum gain error of ±0.1%, a maximum offset voltage of ±150µV, and a typical DC CMRR of 130dB. The device operates over a temperature range of -40°C to +125°C, draws 2.5mA quiescent current, and provides a small-signal bandwidth of 1.1MHz.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance caused by large common-mode voltage transients at the inputs.
• Bidirectional operation enables accurate measurement of voltage drops across shunt resistors independent of the power supply voltage.
• Ultra-precision architecture ensures high accuracy through low offset voltage and minimal gain error drift across the operating temperature range.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'IDR' corresponds to the SOIC-8 surface-mount package variant. Confirm that the B-series gain error and offset voltage specifications align with the required system precision levels. Ensure the input common-mode voltage limits are not exceeded during transient events to maintain device functionality and reliability.

Selection Notes

Select this component when a fixed 100 V/V gain is appropriate for the target current range and shunt resistor value. The B-series offers higher gain error tolerance compared to the A-series; verify if the ±0.1% gain error meets application requirements. Consider the SOIC-8 package dimensions for PCB layout constraints and thermal dissipation needs within the specified operating temperature range.

Part Context

This part belongs to the INA241x family of ultra-precise, bidirectional current sense amplifiers designed for high-voltage measurements in switching systems. The family includes variants with gains ranging from 10 V/V to 200 V/V and different accuracy grades (A and B). The INA241B4IDR specifically utilizes the B-grade silicon characteristics and the D (SOIC-8) package option.

Replacement Considerations

INA241A4IDR: Offers superior accuracy with lower gain error and offset voltage but maintains the same 100 V/V gain and SOIC-8 package.