# JK-MSMD500L-12V

**Jinrui Electronic Materials Co** · Resettable Fuses · 1812

JK-MSMD500L-12V from Jinrui Electronic Materials Co, in a 1812. 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 | Jinrui Electronic Materials Co |
| Package | 1812 |
| 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 |
|---|---|---|---|---|---|---|---|
| Maximum voltage (VMAX) | VMAX |  |  | 12 | V |  | 3 |
| Maximum fault current (IMAX) | IMAX |  |  | 50 | A |  | 3 |
| Hold current (IH) | IH |  |  | 5 | A |  | 3 |
| Trip current (IT) | IT | 10 |  |  | A |  | 3 |
| Maximum time to trip |  |  |  | 2 | Sec | at 25.0 A trip current | 3 |
| Minimum device resistance before trip (RiMIN) | RiMIN | 0.003 |  |  | Ω |  | 3 |
| Maximum device resistance one hour post reflow (R1MAX) | R1MAX |  |  | 0.014 | Ω |  | 3 |
| Operating temperature |  | -40 |  | 85 | ℃ |  | 1 |
| Passive aging resistance change |  | -10 |  | 10 | % | 85℃, 1000 hours | 5 |
| Humidity aging resistance change |  | -5 |  | 5 | % | 85℃/85%RH, 100 hours | 5 |
| Storage maximum ambient temperature |  |  |  | 40 | ℃ | storage | 8 |
| Storage maximum relative humidity |  |  |  | 70 | % | storage | 8 |
| Reflow peak classification temperature (TP) | TP |  |  | 260 | ℃ | Pb-free reflow profile | 6 |
| Time within 5℃ of actual peak temperature (TP) | TP |  |  | 30 | seconds | Pb-free reflow profile | 6 |
| Time from 25℃ to peak temperature |  |  |  | 8 | minutes | Pb-free reflow profile | 6 |
| Typical power dissipation (PD) | PD |  | 1.8 |  | W |  | 3 |
| Thermal shock resistance change |  |  | -30 |  | % | MIL-STD-202 Method 107G, +85℃/-40℃, 20 times | 5 |

## 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 | copper | tin | Terminal Materials Tin-Plated Nickle-copper | 4 |

## CAD (KiCad official)

- Symbol: `JK-MSMD500L-12V`
- Footprint: `Fuse:Fuse_1812_4532Metric`
- 3D model: 1812, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.9 mm nominal _1806_ height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `jk-msmd500l-12v-etched.step` / `jk-msmd500l-12v-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `jk-msmd500l-12v.step` / `jk-msmd500l-12v.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Jinrui Electronic Materials Co datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588920184089792512) (8 pp, sha256 `48d672bc64337506`, 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/jk-msmd500l-12v-datasheet.pdf)