The INA181, INA2181, and INA4181 (INAx181) current sense amplifiers are designed for
cost-optimized applications. These devices are part of a family of 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
INAx181 family 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.
These devices operate from a single 2.7-V to 5.5-V power supply. The single-channel
INA181 draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181 draws a maximum
supply current of 450 µA, and the quad-channel INA4181 draws a maximum supply current of 900
The INA181 is available in a 6-pin, SOT-23 package, the INA2181 is available in an 10-pin
VSSOP package, and the INA4181 is available in a 20-pin TSSOP package. All device options are
specified over the extended operating temperature range of –40°C to +125°C.
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