# SEMF12

**SINO-IC** · TVS · SOT-353

SEMF12 from SINO-IC, in a SOT-353. 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 | TVS protected line channel 1 (steering diodes to pin 2 and pin 5 node), part of up to four bidirectional lines, VRWM 12 V for SEMF12. |
| 2 | GND | power_in | Common ground/reference node of the TVS array, connected to the central diode junction. |
| 3 | I/O2 | passive | TVS protected line channel 2 (steering diodes to the common node), VRWM 12 V for SEMF12. |
| 4 | I/O3 | passive | TVS protected line channel 3 (steering diodes to the common node), VRWM 12 V for SEMF12. |
| 5 | I/O4 | passive | TVS protected line channel 4 (steering diodes to the common node), VRWM 12 V for SEMF12. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | SINO-IC |
| Package | SOT-353 |
| Category | Circuit Protection |
| Pins | 5 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage | VBR | 13.3 | 14.5 | 15 | V | IT = 1 mA | 2 |
| Working Peak Reverse Voltage | VRWM |  | 12 |  | V |  | 2 |
| Maximum Reverse Leakage Current | IR |  |  | 1 | µA | @ VRWM | 2 |
| Test Current | IT |  | 1 |  | mA |  | 2 |
| Capacitance | C |  | 30 |  | pF | 0 V bias | 2 |
| Peak Pulse Power | PPP |  |  | 100 | Watts | tp=8/20μs, per line | 1 |
| Operating Temperature | TJ | -55 |  | 150 | ℃ |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `SEMF12`
- Footprint: `Package_TO_SOT_SMD:SOT-353_SC-70-5`
- 3D model: SOT-353 (KiCad packages3D, STEP)
- 3D model files: `semf12-etched.step` / `semf12-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `semf12.step` / `semf12.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [SINO-IC datasheet](docs/semf12-datasheet.pdf) (4 pp, sha256 `2aa95c758503f9cb`, retrieved 2026-10-31, 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/semf12-datasheet.pdf)