INA281A5IDBVT

Overview

The INA281A5IDBVT 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 a fixed gain of 500 V/V. The device offers a bandwidth of 900 kHz, a slew rate of 2.5 V/µs, and a quiescent current of 1.5 mA. Key electrical specifications include a maximum gain error of ±0.5%, an input offset voltage of ±150 µV, and a DC CMRR of 120 dB. It operates on a single supply from 2.7 V to 20 V and is housed in a space-saving SOT-23-5 package.

Feature Summary

• Supports wide common-mode input voltages from -4 V to +110 V for flexible high-side or low-side sensing.
• Provides a fixed internal gain of 500 V/V with high precision and low drift characteristics.
• Features a zero-drift architecture ensuring accurate measurement of low differential input signals.
• Delivers high-speed performance suitable for rapid overcurrent detection and protection.

Applications

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

Procurement Notes

Verify the specific suffix IDBVT corresponds to the SOT-23-5 package and reel packaging configuration required for your assembly process. Confirm that the A5 designation matches the necessary 500 V/V gain for your signal conditioning requirements. Ensure the component meets all environmental and reliability standards specified in the official datasheet before finalizing procurement.

Selection Notes

Select this part when a high gain of 500 V/V is required to amplify small shunt voltages. It is suitable for applications needing operation at common-mode voltages up to 110 V. Consider the 900 kHz bandwidth and 2.5 V/µs slew rate for fast transient response needs. Verify that the output swing capabilities align with your ADC or microcontroller input ranges.

Part Context

This component belongs to the INA281 family of high-precision current-sense amplifiers designed for demanding industrial and telecom environments. The family provides multiple gain options to optimize dynamic range. The INA281A5 variant specifically targets applications requiring maximum amplification of minute voltage drops across sense resistors while maintaining high accuracy.

Replacement Considerations

Other members of the INA281 family such as INA281A1 through INA281A4 offer different fixed gains (20 V/V to 200 V/V) but share similar electrical characteristics and pinouts. Ensure the replacement gain matches the system design requirements for full-scale output voltage.