INA281B3IDBVT

Overview

The INA281B3IDBVT 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 at this gain setting and a slew rate of 2.5 V/µs. Packaged in a space-saving SOT-23-5 (DBV) 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 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)
• 48-V rack server power supplies
• Solenoid and valve control systems

Procurement Notes

Verify the specific suffix IDBVT corresponds to the SOT-23-5 package variant and reel/cut-tape availability. Confirm that the B-grade accuracy specifications meet the design requirements for gain error and offset voltage. Ensure the component is sourced from authorized distributors to guarantee authenticity and traceability.

Selection Notes

Select the INA281B3IDBVT when a fixed gain of 100 V/V is required for high-side or low-side sensing. Consider its wide common-mode range for applications involving voltages up to 110 V. Evaluate the trade-off between the 1.5 mA quiescent current and the precision benefits of the zero-drift topology compared to standard amplifiers.

Part Context

This component belongs to the INA281 family of current-sense amplifiers designed for high-voltage industrial and telecom environments. The 'B' designation indicates a specific accuracy grade within the series, offering tighter gain error and offset specifications compared to the 'A' grade variants.

Replacement Considerations

INA281A3IDBVT: Offers similar functionality but with different accuracy grades.

FAQ

Is the INA281B3IDBVT bidirectional?

No, the INA281B3IDBVT is designed for unidirectional operation only, sensing current sourced from a power supply to a load.

What is the maximum differential input voltage?

For the INA281B3 (100 V/V gain), the maximum differential input voltage is limited by the output swing; typically, the device handles up to 1 V differential input at VS = 20 V.