# UDT23A12L02

**Brightking** · ESD And Surge Protection (TVS/ESD) · SOT-23

UDT23A12L02 from Brightking, in a SOT-23. 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 | First protected high-speed data line (steering diode to pin 3 common), 12V VRWM, 1µA max leakage at 12V, 0.8pF typical capacitance to GND. |
| 2 | I/O2 | passive | Second protected high-speed data line (steering diode to pin 3 common), 12V VRWM, 1µA max leakage at 12V, 0.8pF typical capacitance to GND. |
| 3 | GND | power_in | Common ground connection of the TVS array, shared by both I/O diodes in the pin configuration diagram. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Brightking |
| Package | SOT-23 |
| Category | Circuit Protection |
| Pins | 3 |

## 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 power (tp=8/20μs waveform) | PPP |  |  | 400 | W | tp=8/20μs waveform | 1 |
| ESD voltage (Contact discharge) | VESD | -8 |  | 8 | kV | Contact discharge | 1 |
| ESD voltage (Air discharge) | VESD | -15 |  | 15 | kV | Air discharge | 1 |
| Storage & operating temperature range | TSTG, TJ | -55 |  | 150 | ℃ |  | 1 |
| Reverse stand-off voltage | VRWM |  | 12 |  | V |  | 2 |
| Reverse breakdown voltage | VBR |  | 13.3 |  | V | IBR=1mA | 2 |
| Reverse leakage current | IR |  | 1 |  | μA | VR=12V, each I/O pin | 2 |
| Clamping voltage (tp=8/20μs) | VC |  | 25 |  | V | IPP=1A | 2 |
| Off state junction capacitance | CJ |  | 0.8 |  | pF | 0Vdc, f=1MHz, between I/O pins and GND | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | ● Lead Free/RoHS compliant ● Solder reflow temperature: Pure Tin-Sn, 260~270℃ | 1 |

## CAD (KiCad official)

- Symbol: `UDT23A12L02`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `udt23a12l02-etched.step` / `udt23a12l02-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `udt23a12l02.step` / `udt23a12l02.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/8588906925212123136) (6 pp, sha256 `7d0eeae3222b8750`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+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/udt23a12l02-datasheet.pdf)