# INA128HD

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

INA128HD 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 | External resistor connection between pins 1 and 8 for setting gain from 1 to 10000 |
| 2 | V-IN | power_in | Inverting input voltage, protected to ±40 V |
| 3 | V+IN | power_in | Non-inverting input voltage, protected to ±40 V |
| 4 | V- | power_in | Negative power supply voltage from -2.25 V to -18 V |
| 5 | Ref | output | Output voltage reference |
| 6 | VO | output | Output voltage |
| 7 | V+ | power_in | Positive power supply voltage from 2.25 V to 18 V |
| 8 | RG | passive | External resistor connection between pins 1 and 8 for setting gain from 1 to 10000 |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `INA128HD`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ina128hd-etched.step` / `ina128hd-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ina128hd.step` / `ina128hd.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-ht) (33 pp, sha256 `51b3e4b995ff064e`, retrieved 2026-10-05, tier: lcsc)
- **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/ina128hd-datasheet.pdf)