INA281A2IDBVT

Overview

The INA281A2IDBVT 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 gain error of ±0.5%. 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. The component is housed in a space-saving SOT-23-5 package and is specified for operation over an extended temperature range of -40 °C to +125 °C.

Feature Summary

• Supports negative common-mode voltages down to -4 V, enabling precise measurement of recirculating currents in half-bridge applications.
• Utilizes a zero-drift topology to maintain low offset voltage and drift across the full operating temperature range.
• Features a transconductance architecture that ensures low input bias current even at high common-mode voltages.

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 'DBVT' corresponds to the SOT-23-5 package variant when sourcing. Confirm the 'A2' designation matches the required 50 V/V gain setting for your circuit design. Ensure the ordering information aligns with the manufacturer's latest datasheet specifications regarding pinout and thermal characteristics.

Selection Notes

Select this component for applications requiring high-speed response and precision in high-voltage environments. The 50 V/V gain option balances dynamic range and sensitivity effectively. Consider the 1.3 MHz bandwidth for fast overcurrent protection scenarios. Evaluate the SOT-23-5 footprint against available board space constraints.

Part Context

This part belongs to the INA281 family of current-sense amplifiers designed for robust performance in demanding industrial and telecom environments. The family includes various gain options and package types to suit different system requirements while maintaining consistent electrical characteristics and reliability standards.

Replacement Considerations

INA281A2IDBVR shares identical electrical specifications but differs in packaging format. Verify pin compatibility and thermal performance before substitution.