INA281B1IDBVT

Overview

The INA281B1IDBVT 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 20 V/V with a bandwidth of 1.3 MHz and a slew rate of 2.5 V/µs. Key electrical characteristics include a typical offset voltage of ±55 µV, a maximum DC CMRR of 120 dB, and a quiescent current of 1.5 mA. It is housed in a space-saving SOT-23-5 package.

Feature Summary

• Supports wide common-mode input voltages ranging from -4 V to +110 V for versatile high-side or low-side sensing.
• Delivers high accuracy with low offset voltage and excellent common-mode rejection ratio.
• Provides fast response capabilities suitable for rapid overcurrent protection detection.

Applications

• Active antenna system mMIMO (AAS)
• Macro remote radio unit (RRU)
• 48-V rack server power supplies
• Solenoid control circuits

Procurement Notes

Verify the specific suffix 'B1' indicates the 20 V/V gain configuration and 'DBVT' denotes the SOT-23-5 package with tape-and-reel delivery. Confirm that the application requires unidirectional current sensing, as this device does not support bidirectional measurement. Ensure the operating environment stays within the specified temperature range of -40 °C to +125 °C.

Selection Notes

Select this component when a fixed gain of 20 V/V is required for applications involving common-mode voltages up to 110 V. It is suitable for systems needing high bandwidth for fast transient detection. Consider alternative gain variants if different signal amplification levels are necessary for the target shunt resistor values.

Part Context

This part belongs to the INA281 family of current-sense amplifiers designed for precision measurements in harsh electrical environments. The family offers multiple gain options to accommodate various dynamic ranges while maintaining consistent performance metrics such as low bias current and high CMRR across the industrial temperature range.

Replacement Considerations

Compatible substitutes within the same series include INA281A1IDBVT, which shares identical pinout and specifications but may differ in initial offset voltage trim accuracy.

FAQ

Is the INA281B1IDBVT capable of bidirectional current sensing?

No, the INA281B1IDBVT is designed for unidirectional operation only, measuring current flowing from the supply to the load.

What is the maximum common-mode voltage supported by this device?

The device supports a common-mode voltage range from -4 V to +110 V.