INA139NA / 3K | TI Texas Instruments | High-side unidirectional current shunt monitoring amplifier (current output type current detection IC)

INA139NA/3K

I. Interpretation of model suffixes

NA: Represents SOT‑ 23‑ 5 (DBV) package; Chip body silk-screen code: E39

/3K: Roll-up packaging, 3000 pieces per roll, suitable for SMT mass production; There is also a small batch version INA139 NA / 250 (250 pieces / plate)

MSL Level: Level-2, 260°C, 1-year shelf life, RoHS compliant

Appearance: SOT-23-5 package, 5 pins, black plastic package, size 2.9mm × 1.6mm, compact size, suitable for PCB compact layout. Pin definition (5-pin): 1-OUT, 2-GND, 3-IN-, 4-IN+, 5-V+.

2. Core electrical parameters

form

parameter

Specifications

Detection method

High-side detection (measuring current on the bus positive), unidirectional measurement

Common mode voltage range

2.7V-40V, can measure 12V/ 24V power bus

bandwidth

440kHz

Transconductance gain

Fixed 1000 μA/V (1 mA/V), current output architecture

Static current Iq

Typical 60μA, maximum 125μ A, low power consumption

Gain error

Typical ± 0.5%

Imbalanced voltage

Maximum ±500 μV

Operating temperature

-40℃ ~ + 125 ℃, industrial temperature grade

The input differential is maximum.

500mV (recommended full-scale range for shunt resistor is 50-100mV)

Principle: Collect the weak differential voltage at both ends of the shunt resistor Rs, and output a proportional current; By connecting an external RL resistor, it can be converted into a voltage to be sampled by the ADC. The gain is completely set by the external resistor, and it is flexible and adjustable. Texas Inst...。

III. Key Features

Power supply and common mode voltage are independent: the chip power supply V + can be 5V, but it can measure the bus voltage of 40V, and the chip power supply does not need to be equal to the measured bus, which is a major advantage of high-side detection.

Current output architecture: The output is a high-impedance current source, and the output voltage can be freely scaled by an external resistor RL, which is suitable for different ADC input ranges.

Minimal package + low power consumption, friendly to battery-powered devices.

It only supports unidirectional current and cannot measure bidirectional positive and negative current; Bidirectional scenarios require selection of other models.

Compared with INA169 NA/3K: INA169 has a maximum common mode of 60V, and the other pins and package are fully compatible. If you need a higher voltage, choose INA169 from Texas Instruments.

IV. Typical Application Scenarios

Battery management system, portable device, battery charger;

Industrial power supply, 24V system current monitoring;

Computer, communication equipment power current monitoring;

UAV, industrial control board current collection;

Overcurrent protection, load current detection.

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