# UDT14A05L03

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

UDT14A05L03 from Brightking, 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, connected to the TVS diode anode and the GND line of the USB 2.0 connector. |
| 2 | D+ | bidirectional | Protected high-speed data line (D+) steered by the low-capacitance diodes, with 1.5 pF typ and 3 pF max I/O-to-GND capacitance at 0 V, 1 MHz. |
| 3 | D- | bidirectional | Protected high-speed data line (D-) steered by the low-capacitance diodes, with 1.5 pF typ and 3 pF max I/O-to-GND capacitance at 0 V, 1 MHz. |
| 4 | VBUS | power_in | Protected power line (VBUS) connected to the TVS diode cathode, with 5 V reverse stand-off voltage and 6 V min breakdown at 1 mA. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Peak pulse current (tp=8/20us waveform) | IPP |  |  | 12 | A | tp=8/20us waveform | 2 |
| ESD voltage (Contact discharge) | VESD | -30 |  | 30 | kV | Contact discharge | 2 |
| ESD voltage (Air discharge) | VESD | -30 |  | 30 | kV | Air discharge | 2 |
| Storage & operating temperature range | TSTG, TJ | -55 |  | 150 | C |  | 2 |
| Reverse stand-off voltage | VRWM |  |  | 5 | V |  | 2 |
| Reverse breakdown voltage | VBR | 6 |  |  | V | IBR=1mA | 2 |
| Reverse leakage current | IR |  |  | 5 | uA | VR=5V | 2 |
| Clamping voltage (tp=8/20us) | VC |  |  | 9.8 | V | tp=8/20us, IPP=1A | 2 |
| Clamping voltage (tp=8/20us) | VC |  |  | 25 | V | tp=8/20us, IPP=12A | 2 |
| Off state junction capacitance (between I/O pins and GND) | CJ |  | 1.5 | 3 | pF | 0Vdc, f=1MHz | 2 |

## CAD (KiCad official)

- Symbol: `UDT14A05L03`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `udt14a05l03-etched.step` / `udt14a05l03-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `udt14a05l03.step` / `udt14a05l03.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Brightking datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588906776221650944) (5 pp, sha256 `0c9b4fdb38813add`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/udt14a05l03-datasheet.pdf)