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 500 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 10-pin, VSSOP and
WSON packages. 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.