# JK-mSMD030SF

**Shenzhen Jinkaisheng Elec** · Resettable Fuses · 1812

JK-mSMD030SF from Shenzhen Jinkaisheng Elec, 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 pad of the non-polarized PTC device (tin-plated nickel-copper); rated Vmax 30 V dc, Imax 100 A, Ihold 0.30 A and Itrip 0.60 A at 25°C. |
| 2 | 2 | passive | Second terminal pad of the non-polarized PTC device (tin-plated nickel-copper); current flows through the device between the two pads, Ihold 0.30 A and Itrip 0.60 A at 25°C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Jinkaisheng Elec |
| 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 operating voltage | V max |  |  | 30 | V dc | at rated current (Imax) | 1 |
| Maximum fault current | I max |  |  | 100 | A | at rated voltage (Vmax) | 1 |
| Hold current | I hold |  |  | 0.3 | A | 25°C still air | 1 |
| Trip current | I trip | 0.6 |  |  | A | 25°C still air | 1 |
| Power dissipation in tripped state | Pd |  | 0.8 |  | W | tripped state, 25°C still air, at rated voltage | 1 |
| Minimum device resistance prior to tripping | Ri min | 0.25 |  |  | Ω | at 25°C | 1 |
| Maximum device resistance one hour post reflow | R1max |  |  | 3 | Ω | measured one hour post reflow | 1 |
| Time to trip |  |  | 0.1 |  | s |  | 1 |
| Resistance change, passive aging |  | -5 |  | 5 | % | +85°C, 1000 hrs; typical | 1 |
| Resistance change, humidity aging |  | -5 |  | 5 | % | +85°C, 85% R.H., 168 hours; typical | 1 |
| Resistance change, thermal shock |  | -33 |  | 33 | % | +85°C to -40°C, 20 times; typical | 1 |
| Ambient operating temperature |  | -40 |  | 85 | °C | ambient operating | 1 |
| Maximum surface temperature in tripped state |  |  |  | 125 | °C | device in tripped state, 25°C still air | 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 | Copper | tin | Terminal pad materials：Tin-plated Nickel-Copper | 4 |

## CAD (KiCad official)

- Symbol: `JK-mSMD030SF`
- 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-msmd030sf-etched.step` / `jk-msmd030sf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `jk-msmd030sf.step` / `jk-msmd030sf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shenzhen Jinkaisheng Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884131216297984) (6 pp, sha256 `d09fdad3f5a7b662`, 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/jk-msmd030sf-datasheet.pdf)