# SM15

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

SM15 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 | CATHODE1 | passive | Cathode of the first unidirectional transil diode; reverse working voltage VRWM is 15 V max, with breakdown voltage 16.5 V at IT = 1 mA. |
| 2 | CATHODE2 | passive | Cathode of the second unidirectional transil diode; shares the same 15 V reverse working voltage and 16.5 V breakdown ratings as pin 1. |
| 3 | COMMON_ANODE | passive | Common anode shared by both diodes; junction capacitance is specified from pin 1 or pin 2 to pin 3 at VR = 0 V, 1 MHz. |

## 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 | PPPM |  |  | 200 | W | 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 | TP | -40 |  | 125 |  |  | 2 |
| Maximum junction temperature | Tj |  |  | 150 |  |  | 2 |
| ESD voltage, air discharge | VESD |  |  | 15 | kv | EC 61000-4-2 (air discharge) | 2 |
| ESD voltage, contact discharge | VESD |  |  | 8 | kv | EC 61000-4-2 (contact discharge) | 2 |
| Reverse working voltage | VRWM |  |  | 15 | V |  | 2 |
| Clamping voltage |  |  |  | 33 | V | Ipp=6A TP=8/20μS | 2 |
| Junction capacitance (pin 1 or 2 to 3) | C |  |  | 30 | pF | VR=0V f=1MHz (pin 1 or 2 to 3) | 2 |
| Junction capacitance (pin 1 to 2 and 2 to 1) | C |  |  | 15 | pF | VR=0V f=1MHz (pin 1 to 2 and 2 to 1) | 2 |

## CAD (KiCad official)

- Symbol: `SM15`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `sm15-etched.step` / `sm15-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sm15.step` / `sm15.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/8590917119880216576) (3 pp, sha256 `b378177578108f23`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/sm15-datasheet.pdf)