# SMF18CA 18CA

**Shenzhen Jinkaisheng Elec** · TVS · SOD-123F

SMF18CA 18CA from Shenzhen Jinkaisheng Elec, in a SOD-123F. 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 | Terminal 1 of an unpolarised fuse; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised fuse; either orientation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Jinkaisheng Elec |
| Package | SOD-123F |
| Category | TVS/Fuse/Board Level Protection |
| Pins | 2 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reverse stand-off voltage | VR |  | 18 |  | V |  | 2 |
| Breakdown voltage | VBR | 20 |  | 22.1 | V | @IT = 1 mA | 2 |
| Reverse leakage current | IR |  |  | 1 | μA | @VR | 2 |
| Clamping voltage | VC |  |  | 29.2 | V | @IPP = 6.8 A, 10/1000μs | 2 |
| Peak pulse current | IPP |  | 6.8 |  | A | 10/1000μs | 2 |
| Peak pulse power dissipation | PPP |  |  | 200 | W | 10/1000μs waveform | 1 |
| Steady state power dissipation | PM(AV) |  |  | 2.8 | W | TL=75℃ | 1 |
| Maximum instantaneous forward voltage | VF |  |  | 3.5 | V | at 20A for unidirectional | 1 |
| Storage and operating junction temperature range | TSTG/TJ | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance junction to lead | RθJL |  | 100 |  | ℃/W | Typical | 1 |
| Thermal resistance junction to ambient | RθJA |  | 220 |  | ℃/W | Typical | 1 |

## CAD (KiCad official)

- Symbol: `SMF18CA 18CA`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123F (KiCad packages3D, STEP)
- 3D model files: `smf18ca-18ca-etched.step` / `smf18ca-18ca-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smf18ca-18ca.step` / `smf18ca-18ca.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shenzhen Jinkaisheng Elec datasheet](docs/smf18ca-18ca-datasheet.pdf) (6 pp, sha256 `9e5131723862d17a`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `two-terminal convention` (convention), consensus `off` (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/smf18ca-18ca-datasheet.pdf)