36-V, High-Side, Current Output Current Shunt Monitor - INA138


36-V, High-Side, Current Output Current Shunt Monitor

Recommended alternative parts

  • INA225  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Improved accuracy with voltage output


The INA138 and INA168 are high-side, unipolar, current shunt monitors. Wide input common-mode voltage range, low quiescent current, and tiny SOT-23 packaging enable use in a variety of applications.

Input common-mode and power-supply voltages are independent and can range from 2.7 V to 36 V for the INA138 and 2.7 V to 60 V for the INA168. 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 the INA138 and INA168 are available in SOT23-5 and are specified for the –40°C to 125°C temperature range.

For all available packages, see the orderable addendum at the end of the datasheet.


  • Complete Unipolar High-Side Current Measurement Circuit
  • Wide Supply and Common-Mode Range
  • INA138: 2.7 V to 36 V
  • INA168: 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
  • 5-Pin SOT-23 Package

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Parametrics Compare all products in Current Shunt Analog Output

Common Mode Voltage (Max) (V)
Input Offset (+/-) (Max) (uV)
Input Offset Drift (+/-) (Typ) (uV/Degrees Celsius)
Gain (V/V)
Gain Error (%)
CMRR (Min) (dB)
Bandwidth (kHz)
Supply Voltage (Max) (V)
Supply Voltage (Min) (V)
Iq (Max) (mA)
Operating Temperature Range (C)
Package Group
Estimated Package Size (WxL) (mm2)
Common Mode Voltage (Min) (V)
INA138 INA139 INA168 INA169
36     36     60     60    
1000     1000     1000     1000    
1     1     1     1    
Adjustable     Adjustable     Adjustable     Adjustable    
1     1     1     1    
120     120     120     120    
800     4400     800     4400    
36     40     60     60    
2.7     2.7     2.7     2.7    
0.06     0.125     0.06     0.125    
Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
SOT-23     SOT-23     SOT-23     SOT-23    
5SOT-23: 4.64 mm2: 1.6 x 2.9     5SOT-23: 4.64 mm2: 1.6 x 2.9     5SOT-23: 4.64 mm2: 1.6 x 2.9     5SOT-23: 4.64 mm2: 1.6 x 2.9    
2.7     2.7     2.7     2.7    

Other qualified versions of INA138

Version Part Number Definition
Automotive INA138-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects