INA241A2IDR

Overview

The INA241A2IDR is a bidirectional ultra-precise current sense amplifier from Texas Instruments. It features a fixed gain of 20 V/V and operates with a common-mode voltage range of -5V to 110V, independent of the supply voltage. The device supports a single supply voltage from 2.7V to 20V with a typical quiescent current of 2.5mA. Key electrical specifications include a maximum gain error of ±0.01%, an input offset voltage of ±3µV, and a small-signal bandwidth of 1.1MHz at all gains. It provides enhanced PWM rejection for switching systems.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance caused by large common-mode voltage transients in switching applications.
• Ultra-precise architecture ensures high accuracy through low offset voltage and minimal gain error across the operating temperature range.
• Bidirectional operation allows measurement of voltage drops across shunt resistors over a wide common-mode range without supply dependency.

Applications

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

Procurement Notes

Verify the specific suffix IDR corresponds to the SOIC-8 package and tape-and-reel shipping configuration. Confirm that the A2 designation matches the required 20 V/V gain for your circuit design. Ensure compatibility with the -40°C to +125°C operating temperature range specified for industrial applications.

Selection Notes

Select this component when a fixed 20 V/V gain is required for bidirectional current sensing. It is suitable for applications involving high common-mode voltages up to 110V. Consider the 1.1MHz bandwidth for fast transient detection needs. Verify that the SOIC-8 package fits the PCB layout constraints.

Part Context

This device belongs to the INA241x family of ultra-precise current sense amplifiers. The 'A' variant denotes the ultra-precise version with tighter accuracy specifications compared to the standard precision 'B' variant. The 'IDR' suffix indicates the SOIC-8 surface-mount package with reel packaging.

Replacement Considerations

INA241A1IDR (10 V/V gain), INA241A3IDR (50 V/V gain), INA241B2IDR (Standard Precision, 20 V/V gain).

FAQ

How does the INA241A2IDR handle common-mode transients?

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

Is the common-mode voltage range dependent on the supply voltage?

No, the INA241A2IDR operates with a common-mode voltage range of -5V to 110V regardless of the supply voltage, which ranges from 2.7V to 20V.