INA241B3IDDFR

Overview

The INA241B3IDDFR is a bidirectional current sense amplifier from Texas Instruments, featuring a fixed gain of 50 V/V. It operates with a supply voltage range of 2.7V to 20V and supports a common-mode input voltage range from -5V to 110V. The device offers a typical DC CMRR of 130 dB and a maximum gain error of ±0.1%. It provides a small-signal bandwidth of 1.1 MHz and a slew rate of 8 V/µs. Packaged in an 8-pin SOT-23 (DDF) format, it functions within an ambient 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 at the inputs.
• Bidirectional operation enables accurate measurement of voltage drops across shunt resistors over a wide common-mode range independent of supply voltage.
• High small-signal bandwidth ensures fast response for rapid detection and processing of over-current events.

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 B-series accuracy specifications meet the system requirements for gain error and offset voltage drift. Ensure the operating environment remains within the specified -40°C to +125°C thermal limits during deployment.

Selection Notes

Select this component when high-side, low-side, or inline sensing is required with a fixed 50 V/V gain. The B-series variant provides ±0.1% maximum gain error, suitable for applications where ultra-precision A-series tolerances are not strictly necessary. Consider the SOT-23-8 package constraints for PCB layout and thermal dissipation relative to the application's power density.

Part Context

This device belongs to the INA241x family of ultra-precise current sense amplifiers designed for high-voltage switching systems. The 'B' designation indicates a specific accuracy tier with higher gain error and offset voltage compared to the 'A' series. The '3' suffix denotes the 50 V/V gain option, while 'IDDFR' specifies the industrial temperature grade, SOT-23-8 package, and reel packaging.

Replacement Considerations

INA241A3IDDFR offers superior precision with lower gain error and offset voltage but maintains identical pinout and functionality. For automotive applications requiring AEC-Q100 qualification, consider the INA241B3EDRQ1, which utilizes an SOIC-8 package instead of SOT-23-8.