# PESD3V3L4UG

**TECH PUBLIC** · ESD Protection Devices · SOT-353

PESD3V3L4UG from TECH PUBLIC, in a SOT-353. 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/O1 | passive | ESD-protected line 1 with a steered diode path to the common pin 2, rated for ±20 kV air and ±15 kV contact discharge per IEC 61000-4-2 and 0.45 pF typical (0.7 pF max) capacitance to GND. |
| 2 | GND | power_in | Common ground connection shared by all four protection diodes, with a 3.3 V maximum reverse working voltage on the I/O lines relative to it. |
| 3 | I/O2 | passive | ESD-protected line 2 with a steered diode path to the common pin 2, rated for ±20 kV air and ±15 kV contact discharge per IEC 61000-4-2 and 0.45 pF typical (0.7 pF max) capacitance to GND. |
| 4 | I/O3 | passive | ESD-protected line 3 with a steered diode path to the common pin 2, rated for ±20 kV air and ±15 kV contact discharge per IEC 61000-4-2 and 0.45 pF typical (0.7 pF max) capacitance to GND. |
| 5 | I/O4 | passive | ESD-protected line 4 with a steered diode path to the common pin 2, rated for ±20 kV air and ±15 kV contact discharge per IEC 61000-4-2 and 0.45 pF typical (0.7 pF max) capacitance to GND. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECH PUBLIC |
| Package | SOT-353 |
| Category | TVS/Fuse/Board Level Protection |
| Pins | 5 |

## CAD (KiCad official)

- Symbol: `PESD3V3L4UG`
- Footprint: `Package_TO_SOT_SMD:SOT-353_SC-70-5`
- 3D model: SOT-353 (KiCad packages3D, STEP)
- 3D model files: `pesd3v3l4ug-etched.step` / `pesd3v3l4ug-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pesd3v3l4ug.step` / `pesd3v3l4ug.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](docs/pesd3v3l4ug-datasheet.pdf) (4 pp, sha256 `d6ac6cff50dfa2b6`, retrieved 2026-10-28, 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/pesd3v3l4ug-datasheet.pdf)