# 0440008.WR

**Littelfuse** · Disposable Fuses · 1206

0440008.WR from Littelfuse, in a 1206. 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 | One of two Ag/Ni/Sn end terminations of the 1206 fuse; the fuse is non-polarized, rated 8 A (amp code 008.) at 32 V, with 0.00634 ohm nominal resistance. |
| 2 | 2 | passive | Second end termination of the non-polarized 1206 fuse, interchangeable with the other terminal; the package is 3.2 mm x 1.63 mm with 0.52 mm termination bands. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | 1206 |
| 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 |
|---|---|---|---|---|---|---|---|
| Opening time at 25ºC, 100% of ampere rating |  | 4 |  |  | hours | 100% of ampere rating, 0.25A - 8A, 25ºC | 1 |
| Opening time at 25ºC, 350% of ampere rating |  |  |  | 5 | s | 350% of ampere rating, 0.25A - 8A, 25ºC | 1 |
| Operating temperature |  | -55 |  | 150 | ºC | Series operating temperature | 1 |
| Continuous operation current |  |  |  | 80 | % of rated current | Devices operated continuously | 1 |
| Max. voltage rating |  |  |  | 32 | V | Max. Voltage Rating for 8 A (amp code 008.) | 1 |
| Ampere rating |  |  | 8 |  | A | Amp code 008. | 1 |
| Nominal resistance |  |  | 0.00634 |  | Ohms | Measured with < 10% rated current | 1 |
| Nominal melting I2t |  |  | 12.95 |  | A2Sec. |  | 1 |
| Nominal voltage drop at rated current |  |  | 0.0655 |  | V | Measured at rated current after temperature has stabilized | 1 |
| Nominal power dissipation at rated current |  |  | 0.524 |  | W | At rated current | 1 |
| Wave soldering temperature |  |  |  | 260 | °C | 10 seconds max | 2 |
| Reflow peak temperature | TP |  |  | 260 | °C | Pb-free reflow; do not exceed 260°C | 2 |

## 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 |  | tin | Terminations: Ag / Ni / Sn (100% Lead-free) Element Cover Coating: Lead-free Glass | 3 |

## CAD (KiCad official)

- Symbol: `0440008.WR`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `0440008-wr-etched.step` / `0440008-wr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `0440008-wr.step` / `0440008-wr.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/8588910129161256960) (3 pp, sha256 `39359c45db276d92`, 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/0440008-wr-datasheet.pdf)