INA241B1IDDFR

Overview

The INA241B1IDDFR is a bidirectional ultra-precise current sense amplifier from the Texas Instruments INA241B series. It features a fixed gain of 10V/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 gain error of ±0.1%, a maximum offset voltage of ±150µV, and a typical DC common-mode rejection ratio (CMRR) of 130dB. It offers a small-signal bandwidth of 1.1MHz and draws a quiescent current of 2.5mA. The component is housed in an 8-pin SOT-23 package.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbances caused by large common-mode voltage transients associated with switching systems.
• Bidirectional operation enables accurate measurement of voltage drops across shunt resistors over a wide common-mode range from -5V to 110V.
• High precision is achieved through low offset voltage, small gain error, and high DC CMRR for reliable current sensing.
• Fixed gain of 10V/V allows optimization between available shunt resistor values and wide output dynamic range requirements.

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 industrial temperature grade (-40°C to +125°C). Confirm that the B variant gain of 10V/V matches the system design requirements, as other variants offer different gains. Ensure compatibility with the target PCB footprint for the DDF package. Check for any recent documentation updates or pinout changes before finalizing procurement.

Selection Notes

Select this part when a fixed gain of 10V/V is required for high-side, inline, or low-side current sensing applications. It is suitable for systems experiencing large common-mode voltage transients up to 110V. Consider the B-series accuracy specifications if higher precision than the A-series is not strictly necessary but cost efficiency is desired. Ensure the application benefits from the enhanced PWM rejection capabilities for noisy switching environments.

Part Context

The INA241B1IDDFR belongs to the INA241x family of ultra-precise, bidirectional current sense amplifiers. This family is designed for high-voltage measurements in switching systems with large common-mode voltage transients. The INA241B series specifically offers a gain error of ±0.1% and offset voltage of ±150µV, providing a balance of performance and value compared to the higher-precision INA241A series.

Replacement Considerations

INA241A1IDDFR: Offers higher precision with ±0.01% gain error and ±10µV offset voltage. INA241B2IDDFR: Provides a fixed gain of 20V/V instead of 10V/V. INA241B3IDDFR: Features a fixed gain of 50V/V. All listed alternatives share the same SOT-23-8 package and general operational characteristics within the INA241B series.