INA241A4IDDFR

Overview

The INA241A4IDDFR is a bidirectional ultra-precise current sense amplifier from Texas Instruments. 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, independent of the supply voltage. Key electrical specifications include a maximum offset voltage of ±3µV, 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 disturbances caused by large common-mode voltage transients in switching systems.
• Zero-drift architecture ensures high precision with low offset voltage and minimal drift across the full operating temperature range.
• Bidirectional operation allows accurate measurement of voltage drops across shunt resistors over a wide common-mode range.

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 and tape-and-reel shipping configuration. Confirm that the A4 designation matches the required 100 V/V gain for your design. Ensure compatibility with the -5V to 110V common-mode voltage requirements of your target application before finalizing procurement.

Selection Notes

Select this component when a fixed 100 V/V gain is necessary for high-side or low-side current sensing. It is suitable for applications requiring precise measurements in environments with significant common-mode noise or fast switching transients. Consider the SOT-23-8 package constraints if board space is limited.

Part Context

This part belongs to the INA241x family of ultra-precise current sense amplifiers. The 'A' variant denotes higher accuracy specifications compared to the 'B' version. The '4' indicates a fixed gain of 100 V/V. The 'IDDFR' suffix specifies the industrial temperature grade, SOT-23-8 thin package, and reel packaging format.

Replacement Considerations

INA241A4IDGKR (VSSOP-8 package)

FAQ

How does the INA241A4 handle common-mode voltage transients?

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

Is the input bias current dependent on the common-mode voltage?

No, the input bias current remains constant at approximately 35µA across the entire common-mode voltage range from -5V to 110V.