# 1812L075PR

**Littelfuse** · Resettable Fuses · 1812

1812L075PR from Littelfuse, 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 1812L075 PTC (0.75 A hold, 1.50 A trip, 13.2 Vdc max, 100 A max fault current); interchangeable with the other terminal. |
| 2 | 2 | passive | Non-polarized solder-plated copper terminal of the 1812L075 PTC (0.75 A hold, 1.50 A trip, 13.2 Vdc max, 100 A max fault current); interchangeable with the other terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| 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 |
|---|---|---|---|---|---|---|---|
| Hold current (I hold) | I hold |  | 0.75 |  | A | 20°C still air | 1 |
| Trip current (I trip) | I trip |  | 1.5 |  | A | 20°C still air | 1 |
| Maximum voltage (V max) | Vmax |  |  | 13.2 | Vdc |  | 1 |
| Maximum fault current (I max) | Imax |  |  | 100 | A |  | 1 |
| Power dissipated in tripped state (Pd) | Pd |  | 0.8 |  | W | tripped state at 20°C still air | 1 |
| Max. time to trip |  |  |  | 0.2 | s | at 8.00 A | 1 |
| Minimum resistance (R min) | R min | 0.1 |  |  | Ω | initial (un-soldered) state | 1 |
| Maximum resistance (R 1max) | R 1max |  |  | 0.45 | Ω | at 20°C, one hour after tripping or reflow soldering of 260°C for 20 sec | 1 |
| Operating/storage temperature |  | -40 |  | 85 | °C | Operating/Storage Temp. | 3 |
| Max. device surface temperature in tripped state |  |  |  | 125 | °C | in tripped state | 3 |
| Passive aging resistance change |  | -5 |  | 5 | % | +85°C, 1000 hours; typical resistance change | 3 |
| Humidity aging resistance change |  | -5 |  | 5 | % | +85°C, 85% R.H., 1000 hours; typical resistance change | 3 |
| Thermal shock resistance change |  |  | -30 |  | % | MIL-STD-202 Method 107, +85°C/-40°C 20 times; typical resistance change | 3 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | Copper |  | Terminal Material Solder-Plated Copper (Solder Material: | 3 |

## CAD (KiCad official)

- Symbol: `1812L075PR`
- 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: `1812l075pr-etched.step` / `1812l075pr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1812l075pr.step` / `1812l075pr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Littelfuse datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588899986939514880) (7 pp, sha256 `6208de21968a51c9`, retrieved 2026-10-18, 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/1812l075pr-datasheet.pdf)