INA139NA/3K TI (Texas Instruments) High‑Side Unipolar Shunt Current Monitor (Current‑Sense Amplifier

2026-08-08 166

INA139NA/3KTI (Texas Instruments) High‑Side Unipolar Shunt Current Monitor (Current‑Sense Amplifier)

Parameter	Specification
Package	SOT‑23‑5 (DBV)
Common‑Mode Voltage Range	2.7V ~ 40V
Quiescent Current	60μA (Typical)
Bandwidth	440kHz
Transconductance	1000μA/V (Output Current = 1mA/V × Shunt Resistor Voltage Drop)
Input Offset Voltage	±1.5 mV (Maximum)
Sensed Differential Voltage Range	100~500mV
Operating Temperature	‑40℃ ~ +125℃
Output Type	Current output; convert to voltage via external resistor
Gain Configuration	Customizable gain with single external resistor
Channel	Single‑channel, unidirectional current measurement

Battery‑powered devices: Lithium‑ion battery charge‑discharge monitoring, portable equipment, UPS backup power supplies
Industrial control: PLC modules, sensor power supply loops, solenoid valve / motor overcurrent protection
Power supply systems: DC‑DC modules, server power supplies, adapter current monitoring
Consumer / IoT: Smart hardware, auxiliary detection for charging piles
Drones & robots: Flight‑control power‑loop current monitoring, motor bus overcurrent protection
Non‑safety automotive applications: Current monitoring for car lights and peripheral power supplies (non‑AEC‑Q100 grade)

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