# TL431ASA-TP

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

TL431ASA-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 shunt regulator (VKA max 36 V, continuous cathode current 1 mA to 100 mA); connect to the output node, and to REF for VKA = VREF. |
| 2 | REF | input | Reference input that sets the cathode voltage via an external divider, with VREF typically 2.495 V (2.483 V to 2.507 V) and reference input current rated at 10 mA maximum. |
| 3 | ANODE | power_in | Anode of the shunt regulator, connected to ground; all voltage ratings 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: `TL431ASA-TP`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `tl431asa-tp-etched.step` / `tl431asa-tp-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431asa-tp.step` / `tl431asa-tp.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](docs/tl431asa-tp-datasheet.pdf) (5 pp, sha256 `a7f3f684a173abf4`, retrieved 2026-10-10, 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/tl431asa-tp-datasheet.pdf)