INA241B4IDDFR

Overview

The INA241B4IDDFR is a bidirectional current sense amplifier from the Texas Instruments INA241B series, housed in an 8-pin SOT-23 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 common-mode input voltage range from -5V to 110V. Key electrical specifications include a maximum offset voltage of ±150µV, a typical DC common-mode rejection ratio (CMRR) of 130dB, and a quiescent current of 2.5mA. It provides a small-signal bandwidth of 1.1MHz and a slew rate of 8V/µs.

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.
• Ultra-precision architecture ensures high accuracy through low offset voltage and minimal gain error drift across the operating temperature 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 variant when sourcing. Confirm that the B-series gain error and offset voltage specifications align with the precision requirements of the target application. Ensure the operating environment remains within the specified -40°C to +125°C temperature range for guaranteed performance.

Selection Notes

Select this component when a fixed 100 V/V gain is required for high-side or low-side current sensing applications involving switching systems. The B-series offers higher offset voltage tolerance compared to the A-series but maintains robust CMRR. Consider the SOT-23-8 package constraints for thermal management and board space limitations in compact designs.

Part Context

This part belongs to the INA241x family of ultra-precise, bidirectional current sense amplifiers designed for high-voltage measurements in systems with large common-mode voltage transients. The INA241B series specifically targets applications requiring enhanced PWM rejection while maintaining high bandwidth and precise gain characteristics across a wide operating temperature range.

Replacement Considerations

INA241A4IDDFR: Offers superior precision with lower offset voltage and gain error but may have different cost implications.

FAQ

How does the INA241B4 handle common-mode voltage transients?

It utilizes enhanced PWM rejection circuitry that holds the output for 1µs during large common-mode transitions, preventing signal disturbance propagation up to 125kHz switching frequencies.

What is the input bias current characteristic of this device?

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