# INA331AIDGKR

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

INA331AIDGKR from Texas Instruments, in a VSSOP-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 gain-setting resistor network connection where gain = 5 + 5(R2/R1). |
| 2 | VIN- | power_in | Negative differential input terminal protected against ±0.5V overshooting if current limited to 10mA. |
| 3 | VIN+ | power_in | Positive differential input terminal protected against ±0.5V overshooting if current limited to 10mA. |
| 4 | V- | power_in | Negative power supply rail and ground reference with maximum supply voltage 7.5V (V+ to V-). |
| 5 | REF | input | Reference voltage terminal setting output zero level; requires low-impedance source <160Ω and minimum 1.2V below V+. |
| 6 | VOUT | output | Rail-to-rail output voltage swinging within 25mV of supply rail for gains ≥10 with loads ≥10kΩ. |
| 7 | V+ | power_in | Positive power supply terminal for +2.7V to +5.5V operating range with 0.1µF bypass capacitor recommended. |
| 8 | Shutdown | input | Active-low shutdown control input pulling below 0.8V to enable low-power mode with quiescent current <1µA. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `INA331AIDGKR`
- Footprint: `Package_SO:VSSOP-8_2.3x2mm_P0.5mm`
- 3D model: VSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `ina331aidgkr-etched.step` / `ina331aidgkr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ina331aidgkr.step` / `ina331aidgkr.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/ina331) (24 pp, sha256 `b563b3023a3cb8c8`, retrieved 2026-10-06, 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/ina331aidgkr-datasheet.pdf)