INA126UA from Texas Instruments, in a SOIC-8. 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	RG	passive	Gain-setting pin. Place external gain resistor RG between pin 1 and pin 8 for gains greater than 5 V/V. Gain equation: G = 5 + 80kΩ/RG.
2	V-IN	input	Inverting (negative) differential input to the instrumentation amplifier. Input signal voltage limited to (V-)-0.7 V to (V+)+0.7 V by internal protection diodes.
3	V+IN	input	Non-inverting (positive) differential input to the instrumentation amplifier. Input signal voltage limited to (V-)-0.7 V to (V+)+0.7 V by internal protection diodes.
4	V-	power_in	Negative supply rail. Total supply voltage V+ to V- range ±1.35 V to ±18 V (36 V max). May be tied to GND for single-supply operation.
5	Ref	input	Output reference input. Must be driven by a low-impedance source or tied to ground; sets the DC reference for the output (VO = (V+IN - V-IN)·G + VRef).
6	VO	output	Amplifier output. Delivers the amplified differential input signal referred to the Ref pin.
7	V+	power_in	Positive supply rail. Total supply voltage V+ to V- range ±1.35 V to ±18 V (36 V max).
8	RG	passive	Gain-setting pin. Place external gain resistor RG between pin 1 and pin 8 for gains greater than 5 V/V. Gain equation: G = 5 + 80kΩ/RG.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	Op-amp/Cmp
Pins	8

Ordering variants

Same part, different packaging or reel option.

INA126UAU
INA126UA
INA126UAP
INA126UAPA
INA126UAE
INA126UAEA

CAD (KiCad official)

Symbol: INA126UA
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ina126ua.step`	122 KB	You want the bare part, or you mark your own boards.
`ina126ua-etched.step`	1.6 MB	You want the part with `INA126UA` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 404 faces against 147 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 (35 pp, sha256 b11e90da09e07d6a, 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