INA241B2IDDFR

Overview

The INA241B2IDDFR is a bidirectional current sense amplifier from the Texas Instruments INA241B series, housed in an 8-pin SOT-23 package. It provides a fixed gain of 20 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 maximum offset voltage of ±150µV, and a typical DC common-mode rejection ratio (CMRR) of 130dB. It features a small signal bandwidth of 1.1MHz and draws a quiescent current of 2.5mA.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output disturbances caused by high-speed common-mode voltage transients associated with switching systems.
• Bidirectional operation enables accurate measurement of voltage drops across shunt resistors for both positive and negative current flow.
• Wide common-mode voltage range allows sensing independent of the power supply voltage, supporting high-side, low-side, and inline configurations.

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 accuracy parameters meet the system requirements for gain error and offset voltage drift. Ensure the operating temperature range aligns with the specified -40°C to +125°C limits for the intended application environment.

Selection Notes

Select this component when a fixed 20 V/V gain is required for bidirectional current sensing applications. The B-series offers higher precision than standard amplifiers but lower precision than the A-series. Consider the SOT-23-8 package size constraints and thermal characteristics during PCB layout design.

Part Context

This part belongs to the INA241x family of ultra-precise current sense amplifiers designed for high-voltage measurements. The 'B' designation indicates a specific accuracy grade within the family, distinct from the 'A' grade which offers tighter tolerances. The 'DDFR' suffix denotes the SOT-23-8 package type and reel packaging configuration.

Replacement Considerations

INA241A2IDDFR offers similar functionality with improved accuracy specifications including lower offset voltage and gain error.

FAQ

How does the enhanced PWM rejection feature function?

The internal circuitry holds the output stable for 1µs during large common-mode transients, preventing signal disturbance propagation to the output.

What is the maximum common-mode voltage the device can withstand?

The operational common-mode voltage range extends from -5V to 110V, independent of the supply voltage.