INA139NA/3K TI Texas Instruments SOT-23-5 current sensing amplifier chip | current shunt monitor

INA139NA/3K TI Texas Instruments SOT-23-5 current sensing amplifier chip, high-side current detection amplifier (shunt monitor).

Core parameters

Common mode input voltage: 2.7V ~ 36V (the bus voltage being measured, which can be higher than the chip supply voltage) Texas Instruments

Chip supply voltage (Vs): 2.7V-40V

Bandwidth: Typical 220kHz, maximum 440kHz

Static current Iq: Typical 60 μA, Max 125 μA

Offset voltage: ±1000 μV max

CMRR Common Mode Rejection Ratio: Minimum 100dB

Gain setting: External single resistor RL programmable gain, adjustable from 1 to 100 times

Output form: Current output, with external resistance converting it into a voltage signal

Operating temperature: -40℃ ~ +125℃ Texas Instruments

Package: SOT‑23‑5 (DBV)

Packaging: T&R roll tape, 3000 pieces/roll

Main functions

High-side current detection: The voltage drop across the shunt resistor Rs at the positive terminal (high-end) of the power supply does not require disconnecting the GND loop and does not interfere with the load ground, which is a core advantage.

Independent power supply and common mode voltage: The power supply for the chip can be different from the bus voltage being measured. With a bus voltage of 36V, the chip can use a 5V power supply to measure the current on the high-voltage bus.

Single resistor gain setting: By externally connecting only one load resistor RL, the output gain can be set, resulting in a simple circuit and a reduced BOM.

Current output architecture: The output current is proportional to the voltage across the sampling resistor, which is noise-resistant and suitable for long-distance transmission.

Unipolar measurement: It can only measure unidirectional current and cannot detect bidirectional current.

Comparison with the same series: INA169, with the common mode voltage increased to 60V, while the other circuit logic remains consistent.

Scope of Application

Power supply and battery management

- Battery charging and discharging current monitoring, backup power system

 - DC-DC power module, power adapter current monitoring

 ‑ Overcurrent monitoring for servers and industrial control power supplies

industrial equipment

- PLC, industrial controller, servo auxiliary current sampling

 - Motor drive overcurrent protection, short circuit detection

 - Power supply current acquisition for portable industrial instruments

consumer electronics

- Current monitoring for laptop and desktop motherboards

 - Charger and power bank current detection

Prompt

It can only measure unidirectional current; for bidirectional detection, choose INA219, INA226, etc.

High-side sampling, suitable for systems where the negative ground cannot be disconnected; small package SOT23-5, suitable for boards with limited space.

The output is a current, and the backend MCU requires an external resistor to convert it into a voltage before feeding it into the ADC

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INA139NA/3K | TI (Texas Instruments) | SOT-23-5 | Current Sensing Amplifier Chip | High-Side Current Sensing Amplifier | Current Shunt Monitor

For technical and business inquiries, please contact Mr. Zhang at 13430464310