# SM12OC

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

SM12OC from UMW, 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 | Protected bidirectional line 1 (TVS diode path to common pin 3); SM12OC has a 12V working voltage (VRWM) and 13.3V min breakdown at 1mA. |
| 2 | I/O2 | passive | Protected bidirectional line 2 (TVS diode path to common pin 3); SM12OC has a 12V working voltage (VRWM) and 13.3V min breakdown at 1mA. |
| 3 | COMMON | passive | Common node of the two TVS diode pairs, shown joined at pin 3 in the schematic; connect it to the reference (ground) for the protected lines. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SOT-23 |
| Category | TVS/Fuse/Board Level 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=8/20us waveform) | PPP |  |  | 130 | W | tp = 8/20 µs waveform | 2 |
| ESD per IEC 61000-4-2 (Air) | VESD | -30 |  | 30 | kV | IEC 61000-4-2 (Air) | 2 |
| ESD per IEC 61000-4-2 (Contact) | VESD | -20 |  | 20 | kV | IEC 61000-4-2 (Contact) | 2 |
| Junction Temperature | TOPT | -55 |  | 150 | °C |  | 2 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 2 |
| Lead Solder Temperature, Maximum | TL |  |  | 260 | °C | 10 second duration | 2 |
| Reverse working voltage | VRWM |  |  | 12 | V |  | 3 |
| Breakdown voltage | VB | 13.3 |  |  | V | IT = 1 mA | 3 |
| Clamping voltage | VC |  |  | 19 | V | @ 1 A | 3 |
| Clamping voltage | VC |  |  | 26 | V | @ 5 A | 3 |
| Reverse leakage current | IR |  |  | 0.2 | µA |  | 3 |
| Capacitance | CT |  |  | 15 | pF |  | 3 |

## CAD (KiCad official)

- Symbol: `SM12OC`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [UMW datasheet](docs/sm12oc-datasheet.pdf) (7 pp, sha256 `ab41c5036950d20d`, retrieved 2026-11-04, 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/sm12oc-datasheet.pdf)