1 Features
• AEC-Q100 qualified for automotive applications
– Temperature grade 1: –40°C ≤ TA ≤ 125°C
– HBM ESD classification level 2
– CDM ESD classification level C6
• Functional Safety-Capable
– Documentation available to aid functional safety
system design
• Common-mode range (VCM): –0.2V to 26V
• High bandwidth: 350kHz (A1 devices)
• Offset voltage:
– ±150μV (maximum) at VCM = 0V
– ±500μV (maximum) at VCM = 12V
• Output slew rate: 2V/μs
• Bidirectional current-sensing capability
• Accuracy:
– ±1% gain error (maximum)
– 1μV/°C offset drift (maximum)
• Gain options:
– 20V/V (A1 devices)
– 50V/V (A2 devices)
– 100V/V (A3 devices)
– 200V/V (A4 devices)
• Quiescent current: 260μA maximum (INA181-Q1)

2 Applications
• Motor control
• Battery monitors and balancers
• Power management
• Lighting control

3 Description
The INA181-Q1, INA2181-Q1, and INA4181-Q1
(INAx181-Q1) 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 –0.2V to 26V,
independent of the supply voltage. The INAx181-Q1
family integrates a matched resistor gain network in
four, fixed-gain device options: 20V/V, 50V/V, 100V/V,
or 200V/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-Q1 draws
a maximum supply current of 260μA; whereas, the
dual-channel INA2181-Q1 draws a maximum supply
current of 500μA, and the quad-channel INA4181-Q1
draws a maximum supply current of 900μA.
The INA181-Q1 is available in both the 6-pin, SOT-23
and SC70 packages. The INA2181-Q1 is available
in a 10-pin, VSSOP package. The INA4181-Q1 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.