# 0437008.WR

**Littelfuse** · Disposable Fuses · 1206

0437008.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 fuse terminal (Ag/Ni/Sn end termination, 0.520 ±0.200 mm long); the fuse is non-polarized, rated 8 A, 32 V, and the two terminals are interchangeable. |
| 2 | 2 | passive | Other fuse terminal (Ag/Ni/Sn end termination, 0.520 ±0.200 mm long); the fuse is non-polarized, rated 8 A, 32 V, and the two terminals are interchangeable. |

## 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 100% of rated current |  | 4 |  |  | hours | 250mA-8A, at 25ºC | 1 |
| Opening time at 250% of rated current |  |  |  | 5 | seconds | 750mA-8A, at 25ºC | 1 |
| Opening time at 350% of rated current |  |  |  | 1 | second | 750mA-8A, at 25ºC | 1 |
| Maximum voltage rating |  |  |  | 32 | V |  | 1 |
| Interrupting rating |  |  |  | 50 | A | @ 32 V AC/35 V DC | 1 |
| Nominal resistance |  |  | 0.008 |  | Ohms | Measured with <10% rated current | 1 |
| Nominal melting I2t |  |  | 7.23 |  | A2Sec. |  | 1 |
| Nominal voltage drop at rated current |  |  | 0.13 |  | V | At rated current, after temperature has stabilized | 1 |
| Nominal power dissipation at rated current |  |  | 1.04 |  | W | At rated current | 1 |
| Operating temperature |  | -55 |  | 150 | ºC |  | 1 |
| Continuous operating current |  |  |  | 80 | % of rated current | Continuous operation | 1 |
| Peak reflow temperature (TP) | TP |  |  | 260 | °C | Pb-free reflow; printed as 260 +0/-5 °C | 2 |
| Wave soldering temperature |  |  |  | 260 | °C | Wave soldering | 2 |
| Wave soldering time |  |  |  | 10 | seconds | Wave soldering | 2 |
| Time 25°C to peak temperature |  |  |  | 8 | minutes | Pb-free reflow | 2 |

## CAD (KiCad official)

- Symbol: `0437008.WR`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `0437008-wr-etched.step` / `0437008-wr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `0437008-wr.step` / `0437008-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/8588907091943960576) (3 pp, sha256 `a7789cf92a0beba5`, retrieved 2026-10-13, 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/0437008-wr-datasheet.pdf)