INA281A3IDBVT

Overview

The INA281A3IDBVT 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 100 V/V with a typical offset voltage of ±30 µV and a maximum gain error of ±0.5%. It offers a bandwidth of 1 MHz and a slew rate of 2.5 V/µs, drawing 1.5 mA of quiescent current. 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 recirculating current measurement
• Provides high DC common-mode rejection ratio of 120 dB
• Features low input bias current of 20 µA at maximum common-mode voltage
• Utilizes zero-drift topology for accurate low-voltage sensing

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 IDBVT indicates tape-and-reel packaging upon ordering. Confirm the A3 designation corresponds to the required 100 V/V gain for the target application. Ensure the component meets RoHS compliance requirements for the intended market. Cross-reference the datasheet revision date to confirm electrical characteristics match the design specifications.

Selection Notes

Select this part when a fixed 100 V/V gain is optimal for the signal-to-noise ratio. The wide common-mode range accommodates both high-side and low-side configurations. Consider the 1 MHz bandwidth for applications requiring fast overcurrent protection response times. Verify that the output swing limitations align with the downstream ADC or MCU input ranges.

Part Context

This component belongs to the INA281 family of current-sense amplifiers designed for high-performance industrial and telecom applications. The family includes variants with gains ranging from 20 V/V to 500 V/V. The INA281 series is distinguished by its ability to operate below ground potential, making it suitable for half-bridge and bidirectional shunt monitoring where negative common-mode voltages occur.

Replacement Considerations

INA281A3IDBVR is the reel-compatible variant with identical electrical specifications but different packaging form factor.