INA241A2IDDFR

Overview

The INA241A2IDDFR is a bidirectional, ultra-precise current sense amplifier from Texas Instruments. It features a fixed gain of 20V/V and operates with a common-mode voltage range of -5V to 110V. The device supports a supply voltage between 2.7V and 20V. Key electrical specifications include a maximum gain error of ±0.01%, an input offset voltage of ±3µV (max), and a typical DC CMRR of 166dB. It offers a small-signal bandwidth of 1.1MHz and a slew rate of 8V/µs. The component is housed in an 8-pin SOT-23 package.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance caused by large common-mode voltage transients at the inputs.
• Ultra-precision architecture ensures high accuracy through low offset voltage and minimal gain error across the operating temperature range.
• Bidirectional operation capability allows for accurate measurement of current flow in both directions across the shunt resistor.

Applications

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

Procurement Notes

Verify the specific suffix IDDFR corresponds to the SOT-23-8 package variant when sourcing. Confirm that the A version designation aligns with the required ultra-precision specifications, specifically the ±0.01% gain error limit. Ensure the application environment remains within the specified -40°C to 125°C operating temperature range for guaranteed performance.

Selection Notes

Select this component when a fixed 20V/V gain is optimal for the target current range and shunt resistance value. The wide common-mode range permits high-side sensing independent of the system supply voltage. Consider the 1.1MHz bandwidth for applications requiring rapid over-current detection and processing.

Part Context

This part belongs to the INA241x family of ultra-precise current sense amplifiers. It shares the core zero-drift topology and enhanced PWM rejection features with other variants in the series, differing primarily in gain options and package types. The 'A' designation indicates the ultra-precision grade compared to the standard precision 'B' grade.

Replacement Considerations

INA241A2IDDR

FAQ

How does the INA241A2IDDFR 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 signal.

What is the input bias current characteristic of this amplifier?

The input bias current is typically 35µA per pin and remains constant over the entire common-mode voltage range, unlike many high-voltage amplifiers where it varies with voltage.