# LCDA12C-1

**TECH PUBLIC** · ESD And Surge Protection (TVS/ESD) · SOT-143

LCDA12C-1 from TECH PUBLIC, in a SOT-143. 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 | 1 | passive | Connected internally to pin 4 on the upper rail of the two-diode TVS channels in the page 1 diagram; the datasheet gives no pin name or function text. |
| 2 | 2 | passive | Connected internally to pin 3 on the lower rail of the two-diode TVS channels in the page 1 diagram; the datasheet gives no pin name or function text. |
| 3 | 3 | passive | Connected internally to pin 2 on the lower rail of the TVS channels in the page 1 diagram; the datasheet gives no pin name or function text. |
| 4 | 4 | passive | Connected internally to pin 1 on the upper rail of the TVS channels in the page 1 diagram; the datasheet gives no pin name or function text. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECH PUBLIC |
| Package | SOT-143 |
| Category | Circuit Protection |
| Pins | 4 |

## CAD (KiCad official)

- Symbol: `LCDA12C-1`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `lcda12c-1-etched.step` / `lcda12c-1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lcda12c-1.step` / `lcda12c-1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602938578360291328) (4 pp, sha256 `807e1fb8c61bfd30`, retrieved 2026-10-18, 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/lcda12c-1-datasheet.pdf)