INA139NA from Texas Instruments, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	OUT	output	Output current. Sources a current proportional to the differential input voltage (V_IN+ - V_IN-); an external load resistor R_L converts this to an output voltage V_O = I_S * R_S * R_L / 1 kOhm. Absolute maximum voltage on this pin is 40 V.
2	GND	power_in	Device ground reference.
3	VIN+	input	Positive differential input; connect to the more-positive (supply) side of the external current shunt resistor R_S. Common-mode voltage range is 2.7 V to 40 V (INA139), independent of V+.
4	VIN-	input	Negative differential input; connect to the load side of the external current shunt resistor R_S. Differential input (V_IN+ - V_IN-) absolute maximum range is -40 V to +2 V.
5	V+	power_in	Power-supply voltage input. Recommended operating range 2.7 V to 40 V (INA139); absolute maximum 60 V. Quiescent current is typically 60 uA.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOT-23-5
Category	Op-amp/Cmp
Pins	5

Ordering variants

Same part, different packaging or reel option.

INA139NA
INA139NAIDBVR
INA139NAIDBVT

CAD (KiCad official)

Symbol: INA139NA
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ina139na.step`	85 KB	You want the bare part, or you mark your own boards.
`ina139na-etched.step`	1.3 MB	You want the part with `INA139NA` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 349 faces against 102 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (28 pp, sha256 dbb74b6cdc543135, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF