# INA2331AIPWR

**Texas Instruments** · Instrumentation Amplifiers · TSSOP-14

INA2331AIPWR from Texas Instruments, in a TSSOP-14. 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 | RGA | passive | Channel A gain-setting terminal; external R1/R2 per G = 5 + 5(R2/R1) set gain above 5V/V, and shorting VOUT to RG gives G = 5. |
| 2 | VIN-A | power_in | Channel A inverting input, diode-clamped to the supply rails with signals limited to (V-) - 0.5V to (V+) + 0.5V and 10mA. |
| 3 | VIN+A | power_in | Channel A non-inverting input, diode-clamped to the supply rails with signals limited to (V-) - 0.5V to (V+) + 0.5V and 10mA. |
| 4 | V- | power_in | Negative supply (or ground in single-supply operation), supply range V+ to V- of +2.7V to +5.5V specified and 7.5V absolute maximum. |
| 5 | VIN+B | power_in | Channel B non-inverting input, diode-clamped to the supply rails with signals limited to (V-) - 0.5V to (V+) + 0.5V and 10mA. |
| 6 | VIN-B | power_in | Channel B inverting input, diode-clamped to the supply rails with signals limited to (V-) - 0.5V to (V+) + 0.5V and 10mA. |
| 7 | RGB | passive | Channel B gain-setting terminal; external R1/R2 per G = 5 + 5(R2/R1) set gain above 5V/V, and shorting VOUT to RG gives G = 5. |
| 8 | Shutdown B | input | Channel B shutdown control, nominally connected to V+; pulled below 0.8V on a 5V supply it enters sleep mode with high output impedance. |
| 9 | VOUTB | output | Channel B rail-to-rail output, optimized for loads of 10kΩ or greater and swinging to within 25mV of the rail at 10kΩ. |
| 10 | REFB | input | Channel B reference terminal defining zero output level; needs a low-impedance connection and must be at least 1.2V below the positive supply. |
| 11 | V+ | power_in | Positive supply, +2.7V to +5.5V specified (+2.5V to +5.5V operating), 7.5V absolute maximum V+ to V-, decoupled with 0.1µF. |
| 12 | REFA | input | Channel A reference terminal defining zero output level; needs a low-impedance connection and must be at least 1.2V below the positive supply. |
| 13 | VOUTA | output | Channel A rail-to-rail output, optimized for loads of 10kΩ or greater and swinging to within 25mV of the rail at 10kΩ. |
| 14 | Shutdown A | input | Channel A shutdown control, nominally connected to V+; pulled below 0.8V on a 5V supply it enters sleep mode with high output impedance. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-14 |
| Category | Amplifiers/Comparators |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `INA2331AIPWR`
- Footprint: `Package_SO:TSSOP-14_4.4x5mm_P0.65mm`
- 3D model: TSSOP-14 (KiCad packages3D, STEP)
- 3D model files: `ina2331aipwr-etched.step` / `ina2331aipwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ina2331aipwr.step` / `ina2331aipwr.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/ina2331) (24 pp, sha256 `b563b3023a3cb8c8`, 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/ina2331aipwr-datasheet.pdf)