# SESM12

**SEMIWARE** · ESD Protection Devices · SOT-23

SESM12 from SEMIWARE, 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 | 1 | passive | TVS diode line 1 (anode of first diode); protects one line against ESD, with the SESM12 at VRWM 12.0 V max, VBR 13.3 V min at 1 mA. |
| 2 | 2 | passive | TVS diode line 2 (anode of second diode); protects a second unidirectional line, with the SESM12 at VRWM 12.0 V max, VBR 13.3 V min at 1 mA. |
| 3 | 3 | passive | Common cathode of both TVS diodes; for one bidirectional line, use pins 1 and 3 or 2 and 3 as shown in the pin diagram. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `SESM12`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `sesm12-etched.step` / `sesm12-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sesm12.step` / `sesm12.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [SEMIWARE datasheet](docs/sesm12-datasheet.pdf) (4 pp, sha256 `f3fecd7d1c03f780`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/sesm12-datasheet.pdf)