# 1210L450SLWR

**Littelfuse** · Resettable Fuses · 1210

1210L450SLWR from Littelfuse, in a 1210. 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 | 1210 |
| 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 |
|---|---|---|---|---|---|---|---|
| Minimum trip current | Itrip | 9 |  |  | A | 20℃ still air | 1 |
| Minimum resistance, initial (un-soldered) state | Rmin | 0.001 |  |  | Ω | Un-soldered initial state | 1 |
| Maximum hold current | Ihold |  |  | 4.5 | A | 20℃ still air; maximum current device passes without tripping | 1 |
| Maximum resistance at 20℃ after trip or reflow | R1max |  |  | 0.014 | Ω | 20℃, measured one hour after tripping or reflow soldering of 260℃ for 20 sec | 1 |
| Maximum voltage withstand without damage at rated current | Vmax |  |  | 6 | Vdc | At rated current (Imax) | 1 |
| Maximum fault current withstand without damage at rated voltage | Imax |  |  | 50 | A | At rated voltage (Vmax) | 1 |
| Maximum power dissipated in tripped state | Pd max |  |  | 1 | W | Tripped state, 20℃ still air | 1 |
| Maximum time-to-trip |  |  |  | 2 | s | At 22.50 A current | 1 |

## CAD (KiCad official)

- Symbol: `1210L450SLWR`
- Footprint: `Fuse:Fuse_1210_3225Metric`
- 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files: `1210l450slwr-etched.step` / `1210l450slwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1210l450slwr.step` / `1210l450slwr.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/8588907056736972800) (2 pp, sha256 `1823d8c53345ec10`, 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/1210l450slwr-datasheet.pdf)