INA241B2IDGKR

Overview

The INA241B2IDGKR is a bidirectional current sense amplifier from the Texas Instruments INA241B series. It features a fixed gain of 20 V/V and operates with a common-mode voltage range of -5V to 110V. The device supports a supply voltage between 2.7V and 20V, drawing a typical quiescent current of 2.5mA. Key electrical specifications include a maximum gain error of ±0.1%, an input offset voltage of ±150µV, and a DC CMRR of 130dB. It provides a small-signal bandwidth of 1.1MHz and is housed in an 8-pin VSSOP package.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance 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 IDGKR corresponds to the VSSOP-8 package variant. Confirm that the B-grade accuracy parameters meet system requirements, as they differ from the A-grade version. Ensure the operating environment stays within the specified temperature range of -40°C to +125°C. Check for moisture sensitivity levels if storage conditions are not controlled.

Selection Notes

Select this component when a fixed 20 V/V gain is required for high-side or low-side sensing. The B-series offers higher offset voltage and gain error tolerances compared to the A-series, which may suit cost-sensitive applications. Verify that the 110V common-mode limit covers the maximum bus voltage. Consider the 1.1MHz bandwidth for noise filtering needs.

Part Context

This part belongs to the INA241x family of ultra-precise current sense amplifiers designed for switching systems with large common-mode transients. The 'B' designation indicates specific accuracy grades distinct from the 'A' grade. The 'DGKR' suffix identifies the VSSOP-8 surface-mount package configuration.

Replacement Considerations

INA241A2IDGKR

FAQ

How does the INA241B2 handle common-mode voltage transients?

It utilizes enhanced PWM rejection circuitry that holds the output for 1µs during large common-mode transitions, preventing disturbances from propagating to the output.

What is the maximum common-mode voltage supported?

The device supports an operational common-mode voltage range from -5V to 110V.