INA241A3IDR

Overview

The INA241A3IDR is a bidirectional ultra-precise current sense amplifier with a fixed gain of 50 V/V. It operates within a common-mode voltage range of -5V to 110V and supports a supply voltage from 2.7V to 20V. Key electrical specifications include a maximum offset voltage of ±10µV, a typical DC CMRR of 166dB, and a small-signal bandwidth of 1.1MHz. The device draws 2.5mA of quiescent current and features enhanced PWM rejection for switching systems.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance caused by large common-mode voltage transients at the inputs.
• Ultra-precise zero-drift architecture ensures low offset voltage and minimal drift across the full operating temperature range.
• Bidirectional operation allows accurate measurement of voltage drops across shunt resistors independent of the supply voltage.

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 package and tape-and-reel shipping configuration. Confirm that the A version designation aligns with the required ultra-precise performance metrics, specifically the ±0.01% gain error and ±10µV offset voltage limits. Ensure compatibility with the target system's thermal management requirements for the specified package.

Selection Notes

Select this component when a fixed gain of 50 V/V is required for high-side, inline, or low-side current sensing applications. The wide common-mode range accommodates voltages exceeding the device supply rail. Consider the 1.1MHz bandwidth and fast settling time for detecting rapid over-current events in switching environments.

Part Context

This part belongs to the INA241x family of ultra-precise, bidirectional current sense amplifiers designed for high-voltage measurements in systems with large common-mode voltage transients. The 'A' variant denotes the ultra-precise version with tighter accuracy specifications compared to the standard B version.

Replacement Considerations

INA241B3IDR (Standard precision version)

FAQ

How does the INA241A3IDR handle common-mode voltage transients?

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

What is the input bias current characteristic of this amplifier?

The device draws a typical input bias current of 35µA per pin, which remains constant across the entire common-mode voltage range from -5V to 110V.