INA181A4IDBVR from Texas Instruments, in a SOT-23-6. 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	Analog output voltage. OUT = (IN+ - IN-) x 200 V/V + V_REF, referenced to the REF pin. Drives loads to within the specified swing of V_S and GND.
2	GND	power_in	Device ground (analog return).
3	IN+	input	Current-sense amplifier positive input. For high-side applications, connect to the bus-voltage side of the sense resistor; for low-side applications, connect to the load side of the sense resistor. Common-mode range -0.2 V to +26 V independent of V_S.
4	IN-	input	Current-sense amplifier negative input. For high-side applications, connect to the load side of the sense resistor; for low-side applications, connect to the ground side of the sense resistor.
5	REF	input	Reference input that sets the output zero-current level (0 V to V_S). Tie to GND for unidirectional sensing, or drive to V_S/2 for bidirectional sensing. Drive from a low-impedance source since REF impedance affects gain error.
6	VS	power_in	Positive power-supply pin, 2.7 V to 5.5 V. Bypass with a 0.1 µF ceramic capacitor to GND placed close to the pin. Quiescent current up to 260 µA.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOT-23-6
Category	Op-amp/Cmp
Pins	6

Ordering variants

Same part, different packaging or reel option.

INA181A4IDBVR
INA181A4IDBVT
INA181A4IDBVRIDGSR
INA181A4IDBVRIDGST
INA181A4IDBVRIPWR
INA181A4IDBVRIPWT

CAD (KiCad official)

Symbol: INA181A4IDBVR
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ina181a4idbvr.step`	97 KB	You want the bare part, or you mark your own boards.
`ina181a4idbvr-etched.step`	2.0 MB	You want the part with `INA181A4IDBVR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 518 faces against 117 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 (58 pp, sha256 f6bd362733887a4d, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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