# SRF1812P300

**prosemi** · Resettable Fuses · 1812

SRF1812P300 from prosemi, in a 1812. 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 | prosemi |
| Package | 1812 |
| Category | Circuit 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 |
|---|---|---|---|---|---|---|---|
| Maximum continuous voltage (rated voltage) | Vmax |  |  | 16 | V | at rated current | 1 |
| Maximum fault current | Imax |  |  | 100 | A | at rated voltage | 1 |
| Maximum time to trip | Ttrip |  |  | 4 | s | at I = 8.00 A assigned current | 1 |
| Minimum resistance (initial, un-soldered state) | Rmin | 0.01 |  |  | Ω | initial (un-soldered) state | 1 |
| Maximum resistance at 25℃ one hour after reflow | R1max |  |  | 0.04 | Ω | 25℃, measured one hour after reflow | 1 |
| Hold current | IH |  | 3 |  | A | 25℃ still air | 1 |
| Trip current | IT |  | 6 |  | A | 25℃ still air | 1 |
| Typical power dissipation | Pd |  | 0.8 |  | W | device in still air environment | 1 |
| Hold current derating vs ambient temperature | IH |  | 4.15 |  | A | ambient temperature -40°C | 1 |
| Hold current derating vs ambient temperature | IH |  | 3.76 |  | A | ambient temperature -20°C | 1 |
| Hold current derating vs ambient temperature | IH |  | 3.46 |  | A | ambient temperature 0°C | 1 |
| Hold current derating vs ambient temperature | IH |  | 3 |  | A | ambient temperature 25°C | 1 |
| Hold current derating vs ambient temperature | IH |  | 2.55 |  | A | ambient temperature 40°C | 1 |
| Hold current derating vs ambient temperature | IH |  | 2.28 |  | A | ambient temperature 50°C | 1 |
| Hold current derating vs ambient temperature | IH |  | 2.01 |  | A | ambient temperature 60°C | 1 |
| Hold current derating vs ambient temperature | IH |  | 1.61 |  | A | ambient temperature 70°C | 1 |
| Hold current derating vs ambient temperature | IH |  | 1.33 |  | A | ambient temperature 85°C | 1 |

## CAD (KiCad official)

- Symbol: `SRF1812P300`
- Footprint: `Fuse:Fuse_1812_4532Metric`
- 3D model: 1812, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.9 mm nominal _1806_ height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `srf1812p300-etched.step` / `srf1812p300-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `srf1812p300.step` / `srf1812p300.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [prosemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590918762055225345) (3 pp, sha256 `2f81d5db4fb9e72f`, retrieved 2026-10-15, 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/srf1812p300-datasheet.pdf)