INA281B2IDBVT

Overview

The INA281B2IDBVT is a high-precision, unidirectional current-sense amplifier manufactured by Texas Instruments. It features a wide common-mode voltage range from -4 V to +110 V and operates on a single supply voltage between 2.7 V and 20 V. The device provides a fixed gain of 50 V/V with a typical offset voltage of ±55 µV and a maximum DC CMRR of 140 dB. It offers a bandwidth of 1.3 MHz and a slew rate of 2.5 V/µs, drawing a quiescent current of 1.5 mA. Packaged in a space-saving SOT-23-5 format, it supports an operating temperature range of -40 °C to +125 °C.

Feature Summary

• Supports negative common-mode voltages down to -4 V for precise measurement of recirculating currents in half-bridge applications.
• Features a zero-drift input architecture that ensures low offset voltage and drift across the full operating temperature range.
• Provides high signal throughput with a 1.3 MHz bandwidth and fast slew rate suitable for rapid overcurrent protection detection.

Applications

• Active antenna system mMIMO (AAS)
• Macro remote radio unit (RRU)
• Solenoid control
• Valve control

Procurement Notes

Verify the specific suffix IDBVT corresponds to the SOT-23-5 package variant when sourcing. Confirm the B2 designation indicates the 50 V/V gain setting required for the application. Ensure the component meets AEC-Q100 qualification standards if automotive compliance is necessary. Check datasheet revision history for any updates regarding pinout or electrical characteristics before finalizing the design.

Selection Notes

Select this part for applications requiring high-side or low-side sensing with large common-mode swings. The 50 V/V gain is optimal for balancing dynamic range and noise performance. Consider the 1.5 mA quiescent current against power budget constraints. Verify that the output swing limitations at the chosen supply voltage accommodate the required signal levels without clipping.

Part Context

This component belongs to the INA281 family of current-sense amplifiers designed for high-performance industrial and automotive systems. The family offers multiple gain options ranging from 20 V/V to 500 V/V to suit various shunt resistor values. The INA281 series is characterized by its ability to operate below ground potential, distinguishing it from standard unipolar current sensors.

Replacement Considerations

INA281B2IDBVR

FAQ

Is the INA281B2IDBVT capable of bidirectional current sensing?

No, the INA281B2IDBVT is designed for unidirectional operation only, sensing current sourced from a power supply to a load.

What is the minimum differential input voltage required to keep the output in the linear region?

To ensure linear operation, a differential input voltage greater than 20 mV divided by the gain should be applied, as the zero-current output voltage can be up to 20 mV above ground.