INA281A2IDBVR

Overview

The INA281A2IDBVR is a high-precision, bidirectional current sense amplifier manufactured by Texas Instruments. It operates with a supply voltage range of 2.7 V to 20 V and supports common-mode voltages from -4 V to 110 V. The device features a fixed gain of 50 V/V, a gain bandwidth product of 1.3 MHz, and a typical input offset voltage of 55 µV. It provides a common-mode rejection ratio (CMRR) of 120 dB and an input bias current of 20 µA. Packaged in a compact SOT-23-5 format, it functions within a temperature range of -40°C to +125°C.

Feature Summary

• Supports bidirectional current sensing with wide common-mode voltage range up to 110 V
• Delivers high precision with low input offset voltage and high common-mode rejection ratio
• Features integrated internal gain eliminating the need for external resistors
• Operates efficiently with low quiescent current consumption

Applications

• Industrial process control systems
• Power supply monitoring circuits
• Battery management systems
• Motor control applications

Procurement Notes

Verify the complete part number including suffixes to ensure correct package type and temperature rating. Confirm that the specific variant matches the required gain and accuracy specifications for the target application. Check manufacturer documentation for any recent design changes or obsolescence notices before finalizing procurement decisions.

Selection Notes

Select this component when high-side or low-side current monitoring is required in environments with high common-mode voltages. The fixed 50 V/V gain simplifies circuit design by removing external gain-setting resistors. Ensure the application does not exceed the maximum common-mode voltage limit of 110 V. Consider the SOT-23-5 package constraints for thermal management and PCB layout requirements.

Part Context

This device belongs to the INA281 family of current sense amplifiers designed for high-voltage and high-accuracy applications. It complements other Texas Instruments solutions like the INA180 and INA181 series, offering enhanced performance in terms of common-mode voltage handling and precision. The family targets industrial and automotive sectors requiring reliable current measurement.

Replacement Considerations

Direct replacements include the INA281A1IDBVR for lower accuracy requirements or the INA281A2IDBVT for tape-and-reel packaging options. Verify pin compatibility and electrical parameter alignment when substituting with other current sense amplifiers from different manufacturers.