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INA139NA/3K

TIINA139NA/3K

Texas Instruments
Current Monitor Regulator High-Side SOT-23-5
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Overview

The INA139NA/3K is a high-side, unipolar current shunt monitor designed for wide common-mode voltage ranges from 2.7V to 40V. It converts a differential input voltage across a shunt resistor into a current output, which is then converted back to a voltage using a single external load resistor. With a low quiescent current of only 60uA, it is highly efficient for power-sensitive monitoring applications.

Why Choose This Part

This device offers a high degree of flexibility by allowing the supply voltage to be independent of the input common-mode voltage. Its 440kHz bandwidth enables fast response times for transient detection, while the simple single-resistor gain scaling simplifies circuit design and reduces BOM count.

Applications

Battery Charger Monitoring
Tracking charge and discharge rates in portable electronics and industrial battery packs.
Power Management Systems
Providing real-time current consumption data for system-level power profiling and protection.
Automotive Current Sensing
Measuring current in auxiliary vehicle systems such as lighting, body electronics, and infotainment.
Motor Control Feedback
Monitoring phase or bus current to implement overcurrent protection and control loops.

Key Specifications

Accuracy +/-0.5%
Function Current Monitor
Mounting Type Surface Mount
Package / Case SC-74A, SOT-753
Sensing Method High-Side
Voltage - Input 2.7V ~ 40V
Operating Temperature -40degC ~ 125degC (TA)
Supplier Device Package SOT-23-5

Getting Started

To implement the INA139, place a shunt resistor in the high-side supply path and connect a load resistor from the output pin to ground to set the desired gain. For prototyping, TI offers various current sense evaluation modules (EVMs) that support SOT-23 footprints.

Also Consider

INA169NA/3K TITexas Instruments - Offers a higher common-mode voltage range up to 60V for higher voltage industrial rails.
INA219AIDCNR TITexas Instruments - Features a digital I2C interface for systems requiring direct MCU integration without an external ADC.