# 0501015.WR

**Littelfuse** · Disposable Fuses · 1206

0501015.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 termination (Ag/Ni/Sn); the fuse is non-polarized, rated 20A at 32 V max (DC interrupting rating 150 A @ 32 VDC), with nominal resistance 0.00194 ohm. |
| 2 | 2 | passive | Opposite fuse termination (Ag/Ni/Sn); the fuse is non-polarized and interchangeable with the other terminal, rated 20A at 32 V max. |

## 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 | Ampere rating 10A, 20A (includes 15A), at 25ºC | 1 |
| Opening time at 350% of ampere rating |  |  |  | 5 | seconds | Ampere rating 10A, 20A (includes 15A), at 25ºC | 1 |
| Operating temperature |  | -55 |  | 150 | °C |  | 1 |
| Max. voltage rating |  |  |  | 32 | V | Amp code 015. | 1 |
| Interrupting rating (DC) |  |  |  | 150 | A | @ 32 VDC | 1 |
| Recommended continuous operating current |  |  |  | 80 | % | Percent of rated current, continuous operation | 1 |
| Peak reflow temperature (Pb-free) | TP |  |  | 260 | °C | Pb-free reflow; printed as 260+0/-5 °C; do not exceed 260°C | 2 |
| Wave soldering time |  |  |  | 10 | seconds | Wave soldering at 260°C | 2 |
| Nominal resistance |  |  | 0.0025 |  | Ohms | Measured with < 10% rated current | 1 |
| Nominal melting I2T |  |  | 39.7 |  | A2Sec. | Measured at 1 msec opening time | 1 |
| Nominal voltage drop at rated current |  |  | 0.04843 |  | V | At rated current after temperature stabilized; fuse on board with 3-oz Cu trace | 1 |
| Nominal power dissipation at rated current |  |  | 0.7265 |  | W | At rated current after temperature stabilized; fuse on board with 3-oz Cu trace | 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: `0501015.WR`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `0501015-wr-etched.step` / `0501015-wr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `0501015-wr.step` / `0501015-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/8588899283353812992) (3 pp, sha256 `df9cbc583adab988`, retrieved 2026-10-19, 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/0501015-wr-datasheet.pdf)