# JK-nSMD035SF

**Shenzhen Jinkaisheng Elec** · Resettable Fuses · 1206

JK-nSMD035SF from Shenzhen Jinkaisheng Elec, 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 pad 1 of the non-polarized resettable PTC fuse (Ihold 0.35 A, Itrip 0.75 A, Vmax 6.0 Vdc, Imax 100 A); the two terminals are interchangeable. |
| 2 | 2 | passive | Terminal pad 2 of the non-polarized resettable PTC fuse (Ihold 0.35 A, Itrip 0.75 A, Vmax 6.0 Vdc, Imax 100 A); the two terminals are interchangeable. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Jinkaisheng Elec |
| 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 |
|---|---|---|---|---|---|---|---|
| Maximum operating voltage (V max) | Vmax |  |  | 6 | V dc | At rated current (Imax) | 1 |
| Maximum fault current (I max) | Imax |  |  | 100 | A | At rated voltage (Vmax) | 1 |
| Trip current | Itrip | 0.75 |  |  | A | 25°C still air; minimum current at which device always trips | 1 |
| Hold current | Ihold |  |  | 0.35 | A | 25°C still air; maximum current device will not trip | 1 |
| Device resistance prior to tripping (Ri min) | Ri min | 0.25 |  |  | Ω | Prior to tripping, 25°C | 1 |
| Maximum resistance one hour post reflow (R1max) | R1max |  |  | 1.3 | Ω | Measured one hour post reflow | 1 |
| Power dissipation in tripped state (Pd) | Pd |  | 0.6 |  | W | Tripped state, 25°C still air, at rated voltage | 1 |
| Time to trip |  |  | 0.1 |  | s | Fault current 8.00 A | 1 |
| Passive aging resistance change |  | -5 |  | 5 | % | +85°C, 1000 hrs; printed as ±5% typical | 1 |
| Humidity aging resistance change |  | -5 |  | 5 | % | +85°C, 85% R.H., 168 hours; printed as ±5% typical | 1 |
| Thermal shock resistance change |  | -33 |  | 33 | % | +85°C to -40°C, 20 times; printed as ±33% typical | 1 |
| Ambient operating temperature |  | -40 |  | 85 | °C | Ambient operating conditions | 1 |
| Maximum surface temperature in tripped state |  |  |  | 125 | °C | Device in tripped state | 1 |
| Recommended hold current at ambient |  |  | 0.5 |  | A | Ambient -40°C | 2 |
| Recommended hold current at ambient |  |  | 0.45 |  | A | Ambient -20°C | 2 |
| Recommended hold current at ambient |  |  | 0.4 |  | A | Ambient 0°C | 2 |
| Recommended hold current at ambient |  |  | 0.35 |  | A | Ambient 25°C | 2 |
| Recommended hold current at ambient |  |  | 0.3 |  | A | Ambient 40°C | 2 |
| Recommended hold current at ambient |  |  | 0.27 |  | A | Ambient 50°C | 2 |
| Recommended hold current at ambient |  |  | 0.24 |  | A | Ambient 60°C | 2 |
| Recommended hold current at ambient |  |  | 0.21 |  | A | Ambient 70°C | 2 |
| Recommended hold current at ambient |  |  | 0.15 |  | A | Ambient 85°C | 2 |

## 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-nSMD035SF`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `jk-nsmd035sf-etched.step` / `jk-nsmd035sf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `jk-nsmd035sf.step` / `jk-nsmd035sf.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/8588906407420964864) (6 pp, sha256 `cffac96ad3619f6f`, 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-nsmd035sf-datasheet.pdf)