INA241B5IDDFR

Overview

The INA241B5IDDFR 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 200 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 gain error of ±0.1%, a typical DC common-mode rejection ratio (CMRR) of 130 dB, and a small-signal bandwidth of 1.1 MHz at all gains. It draws a typical quiescent current of 2.5 mA and 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 associated with switching systems.
• Bidirectional operation enables accurate measurement of voltage drops across shunt resistors over a wide common-mode range independent of the supply voltage.
• High small-signal bandwidth of 1.1 MHz ensures rapid detection and processing of over-current events with fast step response settling times.

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 as documented in the manufacturer's ordering information. Confirm that the B-series accuracy grades meet the system requirements for gain error and offset voltage drift before finalizing procurement decisions.

Selection Notes

Select this component when high-side, low-side, or inline sensing is required with a fixed gain of 200 V/V. The B-series variant offers a balance of precision and cost compared to the A-series. Ensure the application involves switching frequencies up to 125kHz to utilize the enhanced PWM rejection capabilities effectively.

Part Context

This part belongs to the INA241x family of ultra-precise, bidirectional current sense amplifiers designed for high-voltage measurements in switching systems. The family includes variants with different gain options ranging from 10 V/V to 200 V/V and various package types including SOIC-8 and VSSOP-8. The INA241B series specifically targets applications requiring moderate precision with robust transient immunity.

Replacement Considerations

Direct functional substitutes within the same family include other INA241B variants with different gain settings, such as INA241B1 through INA241B4, provided the gain difference is acceptable for the design. Cross-family replacements require careful evaluation of CMRR, bandwidth, and common-mode voltage limits.