Texas Instruments' INA181 is a family of cost-optimized, bidirectional, current-sense amplifiers (also called current-shunt monitors) that sense voltage drops across current-sense resistors at common-mode voltages from -0.2 V to +26 V, independent of the supply voltage. The INA181 integrates a matched resistor gain network in four fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

The INA181 operates from a single 2.7 V to 5.5 V power supply, drawing a maximum of 260 µA of supply current.

All device options are specified over the extended operating temperature range of -40°C to +125°C, and are available in a 6-pin, SOT-23 package.