INA139NA/3K High-Side Current Shunt Monitor (C129947, SOT-23-5)

Keep a precise eye on your system's power consumption with the INA139NA/3K high-side current shunt monitor. Designed to measure the voltage drop across a shunt resistor, this IC is an absolute must-have for designing custom Power Distribution Boards (PDBs), Battery Management Systems (BMS), or smart chargers for your FPV drones and robotics projects.

What makes the INA139 stand out is its wide input common-mode voltage range of 2.7V to 40V, which allows it to monitor high-voltage LiPo battery packs (up to 8S+) entirely independently of its own supply voltage. It converts the differential input voltage into a proportional current output, making it extremely easy to interface with any microcontroller's ADC using a single external load resistor. Housed in a tiny SOT-23-5 footprint, it provides robust, industrial-grade current sensing without taking up valuable PCB space.

Key Features:

• High-Side Measurement: Safely monitors current on the positive supply line, keeping the system ground path completely undisturbed.

• Wide Voltage Range: The input common-mode voltage extends from 2.7V up to 40V, perfect for multi-cell LiPo battery setups.

• Independent Supply: The measurement inputs can handle voltages far exceeding the chip's own VCC supply, providing excellent flexibility and safety.

• Easily Scalable: The output is a current proportional to the measured voltage drop, allowing you to set the custom voltage gain with just one external resistor.

Specifications:

• Part Number: INA139NA/3K (LCSC: C129947)

• IC Type: High-Side Current Shunt Monitor

• Common-Mode Input Voltage: 2.7V to 40V

• Supply Voltage: 2.7V to 40V

• Quiescent Current: 60 µA (Typical)

• Package Type: SOT-23-5 (SMD/SMT)