# SMD1812P300SLR

**PTTC Polytronics Tech** · Resettable Fuses · 1812

SMD1812P300SLR from PTTC Polytronics Tech, 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 | Non-polarized solder-plated copper terminal of the PPTC; Ihold 3.00 A, Itrip 6.00 A, Vmax 24 Vdc, Imax 50 A, Rmin 0.001 ohm, R1max 0.030 ohm. |
| 2 | 2 | passive | Non-polarized solder-plated copper terminal of the PPTC; Ihold 3.00 A, Itrip 6.00 A, Vmax 24 Vdc, Imax 50 A, Rmin 0.001 ohm, R1max 0.030 ohm. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | PTTC Polytronics Tech |
| Package | 1812 |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `SMD1812P300SLR`
- 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: `smd1812p300slr-etched.step` / `smd1812p300slr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smd1812p300slr.step` / `smd1812p300slr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [PTTC Polytronics Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588941146122412032) (5 pp, sha256 `7d0aaba755fa726e`, retrieved 2026-10-09, 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/smd1812p300slr-datasheet.pdf)