INA281B5IDBVT

Overview

The INA281B5IDBVT is a high-precision, unidirectional current-sense amplifier from Texas Instruments. It features a wide common-mode voltage range of -4 V to +110 V and operates on a single supply from 2.7 V to 20 V. The device provides a fixed gain of 500 V/V with a typical offset voltage of ±15 µV and a maximum gain error of ±0.5%. It offers a bandwidth of 900 kHz and a slew rate of 2.5 V/µs. Packaged in a space-saving SOT-23-5 format, it supports an operating temperature range from -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 industrial temperature range.
• Provides high signal throughput with a 1.3 MHz bandwidth at lower gains and fast response times suitable for overcurrent protection.

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 tape-and-reel packaging variant when ordering. Confirm the B5 designation indicates the 500 V/V gain option. Ensure the application circuit respects the absolute maximum ratings for differential input voltage and common-mode limits to prevent damage.

Selection Notes

Select this component for applications requiring high accuracy with large common-mode voltages. The 500 V/V gain allows for the use of smaller shunt resistors, reducing power dissipation. Consider the output swing limitations and ensure the differential input signal is sufficient to keep the amplifier within its linear operating region.

Part Context

This part belongs to the INA281 family of current-sense amplifiers designed for high-speed and high-precision measurements. The family includes various gain options ranging from 20 V/V to 500 V/V. The INA281 series is characterized by its ability to operate below ground potential, making it suitable for both high-side and low-side sensing configurations.

Replacement Considerations

INA281A5IDBVT