# 1206FA-R250

**prosemi** · Disposable Fuses · 1206

1206FA-R250 from prosemi, 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 | Terminal 1 of an unpolarised fuse; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised fuse; either orientation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | prosemi |
| 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 amp rating (0.25~40A) |  | 4 |  |  | hours | 0.25~40A; 100% of amp rating | 1 |
| Opening time at 250% of amp rating (0.25~5A) |  |  |  | 5 | seconds | 0.25~5A; 250% of amp rating | 1 |
| Ampere rating |  |  | 0.25 |  | A |  | 1 |
| Typical cold resistance |  |  | 3.608 |  | Ohms | Measured at <10% of rated current, ambient 25℃ | 1 |
| Typical pre-arcing I2t | I2t |  | 0.0004 |  | A Sec | Measured at 10In current | 1 |
| Typical voltage drop |  |  | 1.407 |  | V |  | 1 |
| Operating temperature |  | -55 |  | 150 | ℃ | With proper correction factor applied | 2 |

## CAD (KiCad official)

- Symbol: `1206FA-R250`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `1206fa-r250-etched.step` / `1206fa-r250-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1206fa-r250.step` / `1206fa-r250.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [prosemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590261294235619328) (3 pp, sha256 `f745819c7dd288fa`, 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/1206fa-r250-datasheet.pdf)