INA281A1IDBVT

Overview

The INA281A1IDBVT 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 voltage between 2.7 V and 20 V. The device provides a fixed gain of 20 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. 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 providing low offset voltage and drift for accurate low VSENSE measurements.
• Delivers high signal throughput with 1.3 MHz bandwidth and fast slew rate 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 'VT' indicates tape-and-reel packaging when ordering. Confirm the 'A1' designation corresponds to the required 20 V/V gain setting. Ensure the SOT-23-5 package variant matches the PCB footprint design. Cross-reference the datasheet revision date to confirm electrical characteristics remain consistent with the design requirements.

Selection Notes

Select this component for applications requiring high common-mode voltage tolerance up to 110 V. The 20 V/V gain option is suitable for systems needing lower amplification factors while maintaining high bandwidth. Consider the 1.5 mA quiescent current against power budget constraints. Verify that the unidirectional operation aligns with the current flow direction in the target circuit design.

Part Context

This device belongs to the INA281 family of current-sense amplifiers designed for high-speed and high-precision applications. The family includes variants with gains ranging from 20 V/V to 500 V/V. The INA281 series is engineered to handle wide dynamic ranges and harsh electrical environments, making it suitable for industrial and telecom power systems where accuracy and speed are critical.

Replacement Considerations

Check for other INA281 gain variants if different amplification is needed. Evaluate alternative high-voltage current-sense amplifiers from other manufacturers if pin compatibility or specific performance metrics differ. Ensure any substitute maintains the -4 V to +110 V common-mode range and similar thermal characteristics.