Texas Instruments INA138 Current Sense Amplifier SOT-23 5 Pin

Texas Instruments INA138 Current Sense Amplifier is a high-side, unipolar current shunt monitor housed in a compact SOT-23-5 package with 5 pins. It supports an input common-mode voltage range from 2.7 V to 36 V and draws a quiescent current of 25 µA, making it suitable for precise current measurement.

Overview

The INA138 forms part of the INA1x8 family, which also includes the INA168. While the INA138 supports a range from 2.7 V to 36 V, the INA168 extends this up to 60 V. The device converts a differential input voltage into a current output, which is then reconverted to a voltage using an external load resistor. This architecture enables a gain range from 1 to over 100. The independent input common-mode and power-supply voltages offer design flexibility, and the power supply can be connected on either side of the current measurement shunt.

Key Features

• High-side, unipolar current shunt monitoring
• Input common-mode voltage range from 2.7 V to 36 V
• Quiescent current of 25 µA
• Compact SOT-23-5 package
• External resistor sets gain from 1 to over 100
• Gain bandwidth product of 800 kHz
• Common-mode rejection ratio (CMRR) of 120 dB
• Operating temperature range from -40 °C to 125 °C
• Input offset voltage of 2 mV

Applications

The circuit is designed for current shunt measurement and also supports general measurement and level-shifting tasks. The stated operating temperature range makes it suitable for industrial, automotive, and consumer electronics.

Specifications

• Package: SOT-23-5, 5 pins
• Width: 3.3
• Depth: 1.5
• Height: 4.3
• Weight: 2 g

Choose the Texas Instruments INA138 Current Sense Amplifier when you need a compact high-side current sense solution with a wide common-mode voltage range and a 25 µA quiescent current.