# JK-nSMD150SF

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

JK-nSMD150SF 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 | First terminal of the non-polarized resettable PTC fuse (tin-plated nickel-copper pad); rated Vmax 8.0 Vdc, Ihold 1.50 A, Itrip 3.00 A, Imax 100 A. |
| 2 | 2 | passive | Second terminal of the non-polarized resettable PTC fuse (tin-plated nickel-copper pad); interchangeable with pin 1, series element rated Ihold 1.50 A at 25°C. |

## 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 (Vmax) | Vmax |  |  | 15 | V dc | At rated current (Imax) | 1 |
| Maximum fault current (Imax) | Imax |  |  | 100 | A | At rated voltage (Vmax) | 1 |
| Hold current | I hold |  |  | 1.5 | A | 25°C still air; device will not trip | 1 |
| Trip current | I trip | 3 |  |  | A | 25°C still air; device will always trip | 1 |
| Minimum device resistance prior to tripping | Ri min | 0.04 |  |  | Ω | 25°C, prior to tripping | 1 |
| Maximum device resistance one hour post reflow | R1max |  |  | 0.13 | Ω | One hour post reflow | 1 |
| Resistance change, passive aging |  | -5 |  | 5 | % | +85°C, 1000 hrs | 1 |
| Resistance change, humidity aging |  | -5 |  | 5 | % | +85°C, 85% R.H., 168 hours | 1 |
| Resistance change, thermal shock |  | -33 |  | 33 | % | +85°C to -40°C, 20 times | 1 |
| Ambient operating temperature |  | -40 |  | 85 | °C |  | 1 |
| Maximum surface temperature in tripped state |  |  |  | 125 | °C | Device in tripped state | 1 |
| Storage temperature |  | 0 |  | 35 | ℃ | Storage, ≤70% RH | 3 |
| Average ramp-up rate (Ts max to Tp) |  |  |  | 3 | ℃/second | Pb-free reflow profile | 3 |
| Ramp-down rate |  |  |  | 6 | ℃/second | Pb-free reflow profile | 3 |
| Time 25℃ to peak temperature |  |  |  | 8 | minutes | 25℃ to peak temperature | 3 |
| Peak temperature (Tp) | Tp |  |  | 260 | ℃ | Pb-free assembly reflow | 3 |
| Power dissipation in tripped state (Pd) | Pd |  | 0.8 |  | W | Tripped state, 25°C still air, rated voltage | 1 |
| Time to trip |  |  | 8 |  | Sec |  | 1 |
| Recommended hold current at ambient -40°C |  |  | 2.18 |  | A | Ambient -40°C | 2 |
| Recommended hold current at ambient -20°C |  |  | 1.94 |  | A | Ambient -20°C | 2 |
| Recommended hold current at ambient 0°C |  |  | 1.72 |  | A | Ambient 0°C | 2 |
| Recommended hold current at ambient 25°C |  |  | 1.5 |  | A | Ambient 25°C | 2 |
| Recommended hold current at ambient 40°C |  |  | 1.28 |  | A | Ambient 40°C | 2 |
| Recommended hold current at ambient 50°C |  |  | 1.17 |  | A | Ambient 50°C | 2 |
| Recommended hold current at ambient 60°C |  |  | 1.06 |  | A | Ambient 60°C | 2 |
| Recommended hold current at ambient 70°C |  |  | 0.96 |  | A | Ambient 70°C | 2 |
| Recommended hold current at ambient 85°C |  |  | 0.77 |  | 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-nSMD150SF`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `jk-nsmd150sf-etched.step` / `jk-nsmd150sf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `jk-nsmd150sf.step` / `jk-nsmd150sf.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/8588903781476012032) (6 pp, sha256 `a8f3820f2e67a914`, retrieved 2026-10-18, 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-nsmd150sf-datasheet.pdf)