# TPESD0502S4

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

TPESD0502S4 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 | GND | power_in | Ground reference of the TVS array, common to the steering-diode anodes and the TVS diode anode; I/O ratings (5V VRWM max) are specified to this pin. |
| 2 | I/O1 | passive | Protected data line I/O (Note 1: I/O pins are pin 2 and 3), rated 5V max reverse working voltage to ground with 0.8pF max capacitance to ground. |
| 3 | I/O2 | passive | Protected data line I/O (Note 1: I/O pins are pin 2 and 3), rated 5V max reverse working voltage to ground with 0.4pF max capacitance between I/O pins. |
| 4 | VCC | power_in | Protected power line connection at the top of the steering-diode rails with the TVS diode to pin 1; the datasheet states it protects two data lines and one power line. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `TPESD0502S4`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `tpesd0502s4-etched.step` / `tpesd0502s4-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tpesd0502s4.step` / `tpesd0502s4.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/8588907280632438784) (4 pp, sha256 `c3516958b36beb50`, 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/tpesd0502s4-datasheet.pdf)