# TL431AFDT-TP

**TECH PUBLIC** · Voltage Reference · SOT-23

TL431AFDT-TP from TECH PUBLIC, 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 | CATHODE | passive | Cathode of the adjustable shunt regulator; cathode voltage VKA up to 36 V and continuous cathode current of 1.0 mA to 100 mA. |
| 2 | REF | input | Reference input that sets the output voltage through two external resistors, with a nominal Vref of 2.495 V and a reference input current range of 10 mA maximum. |
| 3 | ANODE | passive | Anode of the regulator, normally connected to ground; all voltage values are referenced to the anode. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `TL431AFDT-TP`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `tl431afdt-tp-etched.step` / `tl431afdt-tp-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431afdt-tp.step` / `tl431afdt-tp.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](docs/tl431afdt-tp-datasheet.pdf) (5 pp, sha256 `f9fcddaff60ea594`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-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/tl431afdt-tp-datasheet.pdf)