# TUSD03FBX

**TECH PUBLIC** · ESD And Surge Protection (TVS/ESD) · SOD-323

TUSD03FBX from TECH PUBLIC, in a SOD-323. 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 | I/O 1 | passive | Bi-directional TVS terminal 1 connected to the protected power or data line; reverse working voltage 3.3V max, ±30kV IEC 61000-4-2 ESD, 1 pF typical capacitance. |
| 2 | I/O 2 | passive | Bi-directional TVS terminal 2, the opposite terminal (typically ground/return side); the device is symmetrical with 4V to 6V breakdown at 1mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECH PUBLIC |
| Package | SOD-323 |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `TUSD03FBX`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `tusd03fbx-etched.step` / `tusd03fbx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tusd03fbx.step` / `tusd03fbx.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/8590902688102371328) (4 pp, sha256 `41485c730a20a29b`, retrieved 2026-10-22, 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/tusd03fbx-datasheet.pdf)