# INA129U

**Texas Instruments** · Instrumentation OpAmps · SOIC-8

INA129U from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | RG | passive | Gain setting pin; connect external resistor between pins 1 and 8 for gain greater than 1. |
| 2 | VIN- | power_in | Negative input; ±40V overvoltage protected. |
| 3 | VIN+ | power_in | Positive input; ±40V overvoltage protected. |
| 4 | V- | power_in | Negative power supply; ±2.25V to ±18V dual supply range. |
| 5 | REF | input | Reference input; must be driven by low impedance source or grounded. |
| 6 | VO | output | Output; VO = G × (VIN+ - VIN-) + VREF. |
| 7 | V+ | power_in | Positive power supply; ±2.25V to ±18V dual supply range. |
| 8 | RG | passive | Gain setting pin; connect external resistor between pins 1 and 8 for gain greater than 1. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Operational Amplifier/Comparator |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `INA129U`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ina129u-etched.step` / `ina129u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ina129u.step` / `ina129u.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/ina129) (42 pp, sha256 `190884220b677d89`, retrieved 2026-10-06, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ina129u-datasheet.pdf)