# PESD3V3S4UD

**TECH PUBLIC** · ESD And Surge Protection (TVS/ESD) · SOT-23-6

PESD3V3S4UD from TECH PUBLIC, in a SOT-23-6. 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 | IO1 | passive | Protected uni-directional line 1 (steering-diode input), rated for 3.3V reverse working voltage and ±30kV IEC 61000-4-2 air/contact discharge. |
| 2 | GND | power_in | Ground reference for the TVS array, shown joined internally to pin 5 in the pin configuration drawing. |
| 3 | IO2 | passive | Protected uni-directional line 2 (steering-diode input), rated for 3.3V reverse working voltage and ±30kV IEC 61000-4-2 air/contact discharge. |
| 4 | IO3 | passive | Protected uni-directional line 3 (steering-diode input), rated for 3.3V reverse working voltage and ±30kV IEC 61000-4-2 air/contact discharge. |
| 5 | GND | power_in | Ground reference for the TVS array, shown joined internally to pin 2 in the pin configuration drawing. |
| 6 | IO4 | passive | Protected uni-directional line 4 (steering-diode input), rated for 3.3V reverse working voltage and ±30kV IEC 61000-4-2 air/contact discharge. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECH PUBLIC |
| Package | SOT-23-6 |
| Category | Circuit Protection |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `PESD3V3S4UD`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `pesd3v3s4ud-etched.step` / `pesd3v3s4ud-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pesd3v3s4ud.step` / `pesd3v3s4ud.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/8590273171942510592) (4 pp, sha256 `79b47d16189bc156`, retrieved 2026-10-09, 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/pesd3v3s4ud-datasheet.pdf)