# R12.100.0.25

**Reomax** · Disposable Fuses · 1206

R12.100.0.25 from Reomax, 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 | First tin-plated end terminal of the non-polarized 250mA slow-blow fuse (rated 125Vdc, 3.2mm x 1.6mm 1206 body), interchangeable with the other terminal. |
| 2 | 2 | passive | Second tin-plated end terminal of the non-polarized 250mA slow-blow fuse (rated 125Vdc, 3.2mm x 1.6mm 1206 body), interchangeable with the other terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Reomax |
| 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 (250mA~30A) |  | 4 |  |  | hours | 100% of amp rating; 4hours, min | 1 |
| Opening time at 350% of rated current (250mA~750mA) |  |  |  | 5 | s | 350% of amp rating, 250mA~750mA; 5.0s max | 1 |
| Opening time at 1000% of rated current (250mA~30A) |  | 0.2 |  | 20 | ms | 1000% of amp rating, 250mA~30A; 0.2ms - 20.0 ms | 1 |
| Insulation resistance (after opening) |  | 10000 |  |  | ohms | After opening; greater than 10,000 ohms | 2 |
| Operating temperature |  | -55 |  | 125 | °C | Operating temperature | 2 |
| Rated current |  |  | 250 |  | mA | Rated current of MPN R12.100.0.25 (250mA) | 1 |
| Typical cold resistance |  |  | 1350 |  | mOhms | Typical cold resistance, rated current 250mA | 1 |
| Typical pre-arcing I²t |  |  | 0.00038 |  | A²Sec | Typical pre-arcing I²t, rated current 250mA | 1 |
| Typical voltage drop |  |  | 3700 |  | mV | Typical voltage drop, rated current 250mA | 1 |
| Solder iron temperature (hand solder) |  |  | 280 |  | °C | Hand solder, solder iron temperature 280±5°C | 2 |
| Heating time (hand solder) |  | 5 |  |  | Seconds | Hand solder; 5 Seconds min | 2 |
| Solder pot temperature |  |  |  | 260 | °C | Wave solder; 260°C max | 2 |
| Solder dwell time |  |  |  | 10 | Seconds | Solder dwell; 10 Seconds max | 2 |
| Reflow peak temperature (TP) | TP |  | 260 |  | °C | Pb-free reflow; printed as 260+0/-5°C | 2 |

## CAD (KiCad official)

- Symbol: `R12.100.0.25`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `r12-100-0-25-etched.step` / `r12-100-0-25-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `r12-100-0-25.step` / `r12-100-0-25.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Reomax datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603165930641895424) (4 pp, sha256 `c1f560e2a821a924`, 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/r12-100-0-25-datasheet.pdf)