# TL431G

**UMW** · Voltage Reference · SOT-23

TL431G from UMW, in a SOT-23. 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 | ANODE | output | Regulated shunt regulator output terminal; output voltage set from 2.495V to 36V using external feedback resistor divider. |
| 2 | REF | input | Reference feedback input terminal; accepts 2.483V to 2.508V from external resistor divider to establish output voltage regulation setpoint. |
| 3 | CATHODE | power_in | Unregulated supply voltage input terminal; accepts 0.5V to 36V with minimum operating current 0.5mA and continuous maximum current 100mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SOT-23 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `TL431G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `tl431g-etched.step` / `tl431g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431g.step` / `tl431g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UMW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757273573100793856) (11 pp, sha256 `b70eadfe49120088`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tl431g-datasheet.pdf)