# LM431BIMX

**Texas Instruments** · Voltage Reference · SOIC-8

LM431BIMX 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 | Cathode | bidirectional | Shunt current and output voltage terminal with maximum voltage rating of 37 V and continuous current range of -10 to 150 mA |
| 2 | Anode | power_in | Anode ground terminal, typically connected to circuit ground for current sinking |
| 3 | Anode | power_in | Anode ground terminal, typically connected to circuit ground for current sinking |
| 4 | NC | unconnected | No internally connected terminal |
| 5 | NC | unconnected | No internally connected terminal |
| 6 | Anode | power_in | Anode ground terminal, typically connected to circuit ground for current sinking |
| 7 | Anode | power_in | Anode ground terminal, typically connected to circuit ground for current sinking |
| 8 | Reference | input | Reference input terminal for programming output voltage with maximum input current of 10 mA |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM431BIMX`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `lm431bimx-etched.step` / `lm431bimx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm431bimx.step` / `lm431bimx.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/lm431) (37 pp, sha256 `9c0bcff4967eaad2`, 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/lm431bimx-datasheet.pdf)