INA241A4IDR

Overview

The INA241A4IDR is a bidirectional ultra-precise current sense amplifier from Texas Instruments, housed in an SOIC-8 package. It features a fixed gain of 100 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. Key electrical specifications include a maximum offset voltage of ±10µV, a typical DC CMRR of 166dB, and a small-signal bandwidth of 1.1MHz at all gains. It draws a quiescent current of 2.5mA and functions within an operating 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 associated with switching systems.
• Ultra-precision architecture provides low offset voltage and minimal gain error drift for accurate high-side, inline, or low-side current measurements.
• Wide common-mode voltage range allows operation independent of the power supply voltage, supporting voltages up to 110V.

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-precision accuracy specifications, specifically the ±0.01% maximum gain error and ±10µV offset voltage limits defined for this grade. Ensure compatibility with the target system's thermal management requirements given the SOIC-8 package dimensions.

Selection Notes

Select the INA241A4IDR when a fixed gain of 100 V/V is required for applications demanding high precision and fast response times. This variant is suitable for systems utilizing shunt resistors where the resulting differential voltage is small but requires significant amplification. Consider the 1.1MHz bandwidth and 8V/µs slew rate for detecting rapid over-current events in switching environments.

Part Context

This component belongs to the INA241x family of ultra-precise, bidirectional current sense amplifiers designed for high-voltage measurements in switching systems. The family offers multiple gain options ranging from 10V/V to 200V/V. The 'A' suffix denotes the ultra-precision grade, characterized by lower offset voltage and gain error compared to the 'B' grade variants within the same series.

Replacement Considerations

INA241B4IDR (High-Precision Grade)

FAQ

How does the INA241A4IDR handle common-mode voltage transients?

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

What is the input bias current characteristic of this amplifier?

The INA241A4IDR draws a typical input bias current of 35µA per pin, which remains constant across the entire common-mode voltage range from -5V to 110V.