# 0805L400SLWR

**Littelfuse** · Resettable Fuses · 0805

0805L400SLWR from Littelfuse, in a 0805. 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 | Littelfuse |
| Package | 0805 |
| 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 voltage rating (V max) | V max |  |  | 6 | Vdc |  | 2 |
| Maximum interrupt current (I max) | I max |  |  | 50 | A |  | 2 |
| Maximum device surface temperature in tripped state |  |  |  | 125 | °C | Tripped state | 6 |
| Minimum resistance (Rmin) | Rmin | 0.003 |  |  | Ω |  | 2 |
| Maximum resistance after trip (R1max) | R1max |  |  | 0.018 | Ω |  | 2 |
| Maximum time-to-trip |  |  |  | 2 | s | At 20.00 A | 2 |
| Operating temperature range |  | -40 |  | 85 | °C |  | 6 |
| Passive aging resistance change |  | -10 |  | 10 | % | +85°C, 1000 hours | 6 |
| Humidity aging resistance change |  | -15 |  | 15 | % | +85°C, 85% R.H., 100 hours | 6 |
| Thermal shock typical resistance change |  |  | -30 |  | % | MIL-STD-202 Method 107, +85°C/-40°C, 20 times | 6 |
| Hold current (I hold) | I hold |  | 4 |  | A |  | 2 |
| Trip current (I trip) | I trip |  | 9 |  | A |  | 2 |
| Power dissipation (P d typ.) | P d typ. |  | 0.6 |  | W |  | 2 |
| Hold current vs ambient temperature |  |  | 5.8 |  | A | Ambient -40°C | 4 |
| Hold current vs ambient temperature |  |  | 5.2 |  | A | Ambient -20°C | 4 |
| Hold current vs ambient temperature |  |  | 4.6 |  | A | Ambient 0°C | 4 |
| Hold current vs ambient temperature |  |  | 4 |  | A | Ambient 20°C | 4 |
| Hold current vs ambient temperature |  |  | 3.4 |  | A | Ambient 40°C | 4 |
| Hold current vs ambient temperature |  |  | 3 |  | A | Ambient 60°C | 4 |
| Hold current vs ambient temperature |  |  | 2.6 |  | A | Ambient 70°C | 4 |
| Hold current vs ambient temperature |  |  | 2.2 |  | A | Ambient 85°C | 4 |

## 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 | 6 |

## CAD (KiCad official)

- Symbol: `0805L400SLWR`
- Footprint: `Fuse:Fuse_0805_2012Metric`
- 3D model: 0805 (KiCad packages3D, STEP)
- 3D model files: `0805l400slwr-etched.step` / `0805l400slwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `0805l400slwr.step` / `0805l400slwr.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/8590273241362300928) (13 pp, sha256 `8d145fa7a736a1e9`, retrieved 2026-10-18, 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/0805l400slwr-datasheet.pdf)