# 0440007.WRA

**Littelfuse** · Disposable Fuses · 1206

0440007.WRA 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 termination (Ag/Ni/Sn) of the non-polarized 7 A element, rated 63 V, 0.00753 ohm nominal resistance, interrupting rating 50A @ 32VAC/63VDC. |
| 2 | 2 | passive | Second fuse termination (Ag/Ni/Sn), interchangeable with the other end; the element is non-polarized and mounts with the marking code facing up. |

## 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 ampere rating |  | 4 |  |  | hours | 100% of ampere rating, 25ºC, minimum | 1 |
| Opening time at 350% of ampere rating |  |  |  | 5 | secs. | 350% of ampere rating, 25ºC, maximum | 1 |
| Operating temperature |  | -55 |  | 150 | ºC |  | 1 |
| Continuous operation current |  |  |  | 80 | % | Continuous operation; percent of rated current | 1 |
| Peak temperature (TP), Pb-free reflow | TP |  |  | 260 | °C | Pb-free reflow; do not exceed 260°C | 2 |
| Wave soldering time |  |  |  | 10 | seconds | Wave soldering at 260°C, maximum | 2 |
| Max. voltage rating |  |  |  | 63 | V |  | 1 |
| Ampere rating |  |  | 7 |  | A | Amp code 007. | 1 |
| Nominal resistance |  |  | 0.00753 |  | Ohms | Measured with < 10% rated current | 1 |
| Nominal melting I2t | I2t |  | 8.464 |  | A²Sec. | Measured at 1 msec opening time | 1 |
| Nominal voltage drop at rated current |  |  | 0.0696 |  | V | At rated current, after temperature has stabilized | 1 |
| Nominal power dissipation at rated current |  |  | 0.487 |  | W | At rated current | 1 |

## 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: `0440007.WRA`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `0440007-wra-etched.step` / `0440007-wra-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `0440007-wra.step` / `0440007-wra.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/8588922075888668672) (3 pp, sha256 `2658fd8ae24a011b`, 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/0440007-wra-datasheet.pdf)