INA188IDR 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. For gains greater than 1, place an external gain resistor R_G between pin 1 and pin 8. Gain equation: G = 1 + (50 kΩ / R_G).
2	VIN-	input	Negative (inverting) analog input of the instrumentation amplifier. High-impedance differential input; common-mode range (V-)+0.1 V to (V+)-1.5 V.
3	VIN+	input	Positive (non-inverting) analog input of the instrumentation amplifier. High-impedance differential input; common-mode range (V-)+0.1 V to (V+)-1.5 V.
4	V-	power_in	Negative supply rail. Connect to ground for single-supply operation, or to the negative supply for dual-supply operation. Absolute-max supply span ±20 V (40 V single).
5	REF	input	Reference input. Sets the output common-mode / offset level (V_OUT = (V_IN+ - V_IN-)·G + V_REF). Must be driven from a low-impedance source or tied to ground; input impedance ≈ 40 kΩ.
6	VOUT	output	Rail-to-rail amplifier output. Short-circuit current ±18 mA; output swings within ~250 mV of the supply rails with R_L = 10 kΩ.
7	V+	power_in	Positive supply rail. Single-supply 4 V to 36 V or dual-supply ±2 V to ±18 V. Quiescent current 1.4 mA typ.
8	RG	passive	Gain setting pin. Complements pin 1; place external R_G between pins 1 and 8 to set gain. Leave open for G = 1.

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.

INA188IDR
INA188IDRJ

CAD (KiCad official)

Symbol: INA188IDR
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
`ina188idr.step`	122 KB	You want the bare part, or you mark your own boards.
`ina188idr-etched.step`	1.9 MB	You want the part with `INA188IDR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 479 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 (41 pp, sha256 dce0bd5f616f35f5, 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