# SM03CN

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

SM03CN from Wild Goose, 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 | LINE1 | passive | Protected line 1, bidirectional ESD clamp to the common pin with 3.3V max reverse working voltage and ±30kV IEC61000-4-2 air/contact rating. |
| 2 | LINE2 | passive | Protected line 2, bidirectional ESD clamp to the common pin with 3.3V max reverse working voltage and ±30kV IEC61000-4-2 air/contact rating. |
| 3 | COMMON | passive | Common pin shared by both protection diodes, connected to ground/reference in the circuit diagram. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Wild Goose |
| 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 = 8/20 μS) | PPPM |  |  | 450 | W | tp = 8/20 μS | 2 |
| Peak pulse current (tp = 8/20 μS) | IPPM |  |  | 38 | A | tp = 8/20 μS | 2 |
| Maximum lead temperature for soldering | TL |  |  | 260 |  | during 10s | 2 |
| Storage temperature range | Tstg | -55 |  | 150 |  |  | 2 |
| Operating temperature range | TOP | -40 |  | 125 |  |  | 2 |
| Maximum junction temperature | TJ |  |  | 150 |  |  | 2 |
| ESD voltage, IEC61000-4-2 air discharge | VESD |  |  | 30 | kv | IEC61000-4-2 air discharge | 2 |
| ESD voltage, IEC61000-4-2 contact discharge | VESD |  |  | 30 | kv | IEC61000-4-2 contact discharge | 2 |
| Breakdown voltage | VBR | 4 |  |  | V | T= 1mA | 2 |
| Leakage current | IR |  |  | 200 | nA | VRWM=3.3V | 2 |
| Clamping voltage | VCL |  |  | 12 | V | Ipp=38A,TP=8/20μS | 2 |
| Junction capacitance | CJ |  | 70 |  | pF | VR=0V f=1MHz | 2 |

## CAD (KiCad official)

- Symbol: `SM03CN`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `sm03cn-etched.step` / `sm03cn-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sm03cn.step` / `sm03cn.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Wild Goose datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590917117930270720) (3 pp, sha256 `4f1858ed340735b0`, 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/sm03cn-datasheet.pdf)