# UET14A05L03

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

UET14A05L03 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 | Common ground side of the TVS array, the return for the lower steering diodes and the zener, with the IO-to-GND junction capacitance specified as 0.6 pF typ / 0.9 pF max. |
| 2 | IO1 | passive | Protected I/O line 1 connected between the steering diode pair, protected to ±25kV air / ±20kV contact ESD (IEC 61000-4-2) and 4A 8/20µs surge, with 0.3 pF typ IO-to-IO capacitance. |
| 3 | IO2 | passive | Protected I/O line 2 connected between the steering diode pair, protected to ±25kV air / ±20kV contact ESD (IEC 61000-4-2) and 4A 8/20µs surge, with 0.3 pF typ IO-to-IO capacitance. |
| 4 | VCC | power_in | Upper rail of the diode array where the steering diodes and the TVS zener connect, for the 5V operating voltage (VRWM 5V max, VBR 6V min at 1mA). |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `UET14A05L03`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `uet14a05l03-etched.step` / `uet14a05l03-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uet14a05l03.step` / `uet14a05l03.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](docs/uet14a05l03-datasheet.pdf) (4 pp, sha256 `c3a50c0418228e8d`, retrieved 2026-11-04, 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/uet14a05l03-datasheet.pdf)