Product
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INA138
  • INA138
  • INA138

INA138

ACTIVE

2.7 to 36V, 800kHz Variable gain current sense amplifier

Texas Instruments INA138 Product Info

1 April 2026 2

Parameters

Product type

Analog output

Common-mode voltage (max) (V)

36

Common-mode voltage (min) (V)

2.7

Input offset (±) (max) (µV)

1000

Input offset drift (±) (typ) (µV/°C)

1

Features

Current Output

Rating

Catalog

Voltage gain (V/V)

adjustable

CMRR (min) (dB)

100

Bandwidth (kHz)

32

Supply voltage (max) (V)

36

Supply voltage (min) (V)

2.7

Iq (max) (mA)

0.06

Number of channels

1

Comparators (#)

0

Gain error (%)

2

Gain error drift (±) (max) (ppm/°C)

100

Operating temperature range (°C)

-40 to 125

Package

SOT-23 (DBV)-5-8.12 mm² 2.9 x 2.8

Features

  • 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
  • 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

Description

The INA138 and INA168 (INA1x8) 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.

 

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