1 Features
1• Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature Range
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C6
• Complete Unipolar High-Side Current-
Measurement Circuit
• Wide Supply and Common-Mode Ranges:
– INA138-Q1: 2.7 V to 36 V
– INA168-Q1: 2.7 V to 60 V
• Independent Supply and Input Common-Mode
Voltages
• Single Resistor Gain Set
• Low Quiescent Current (25 μA Typical)
• Wide Temperature Range: –40°C to +125°C
• Packages: TSSOP-8, SOT-23-5 (INA168-Q1)

2 Applications
• Electric Power Steering (EPS) Systems
• Body Control Modules
• Brake Systems
• Electronic Stability Control (ESC) Systems

3 Description
The INA138-Q1 and INA168-Q1 (INA1x8-Q1) devices
are high-side, unidirectional, current sense amplifiers.
Wide input common-mode voltage range, low
quiescent current, and TSSOP and SOT-23
packaging enable use in a variety of applications.
Input common-mode and power-supply voltages are
independent, and range from 2.7 V to 36 V for the
INA138-Q1, and 2.7 V to 60 V for the INA168-Q1.
Quiescent current is only 25 μA, which permits
connecting the power supply to either side of the
current-measurement shunt with minimal error.
The device converts a differential input voltage to a
current output. This current is converted back to a
voltage with an external load resistor that sets any
gain from 1 to over 100. Although designed for
current shunt measurement, the circuit invites
creative applications in measurement and level
shifting.
Both devices are available in a TSSOP-8 package.
The INA168-Q1 is also available in a SOT-23-5
package. Both devices are specified for the –40°C to
+125°C temperature range.