component
JK-nSMD550L-12
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Jinrui Electronic Materials Co Resettable Fuses, 1206. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
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JK-nSMD550L-12
Jinrui Electronic Materials Co · Resettable Fuses · 1206
JK-nSMD550L-12 from Jinrui Electronic Materials Co, 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 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 | 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 |
|---|---|---|---|---|---|---|---|
| Initial resistance minimum (RiMIN) | RiMIN | 0.002 | Ω | In still air at 25℃ | 3 | ||
| Maximum device resistance one hour post reflow (R1MAX) | R1MAX | 0.01 | Ω | In still air at 25℃, measured one hour post reflow | 3 | ||
| Maximum continuous voltage (VMAX), 12 V variant | VMAX | 12 | V | Continuous voltage at rated current | 3 | ||
| Maximum fault current (IMAX) | IMAX | 50 | A | At rated voltage | 3 | ||
| Maximum time-to-trip at 27.5 A | 2 | s | At 27.5 A, VMAX, 25℃ | 3 | |||
| Trip current (IT) | IT | 11 | A | 25℃ still air | 3 | ||
| Hold current (IH) | IH | 5.5 | A | 25℃ still air | 3 | ||
| Operating temperature | -40 | 85 | ℃ | Operating temperature | 1 | ||
| Maximum ambient temperature for storage | 40 | ℃ | Storage only | 8 | |||
| Maximum relative humidity for storage | 70 | %RH | Storage only | 8 | |||
| Peak/classification temperature (TP) | TP | 260 | ℃ | Pb-free reflow profile | 6 | ||
| Passive aging resistance change | -10 | 10 | % | 85℃, 1000 hours; typical | 5 | ||
| Humidity aging resistance change | -5 | 5 | % | 85℃/85%RH, 100 hours; typical | 5 | ||
| Thermal shock resistance change | -30 | % | MIL-STD-202 Method 107G, +85℃/-40℃, 20 cycles; typical | 5 | |||
| Typical power dissipation | PD | 1.2 | W | 25℃ still air | 3 |
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-nSMD550L-12 - Footprint:
Fuse:Fuse_1206_3216Metric - 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files:
jk-nsmd550l-12-etched.step/jk-nsmd550l-12-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);jk-nsmd550l-12.step/jk-nsmd550l-12.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Jinrui Electronic Materials Co datasheet (8 pp, sha256
65357ef49c2d2f91, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarytwo-terminal convention(convention), consensusoff(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).
# JK-nSMD550L-12
**Jinrui Electronic Materials Co** · Resettable Fuses · 1206
JK-nSMD550L-12 from Jinrui Electronic Materials Co, 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 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 | 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 |
|---|---|---|---|---|---|---|---|
| Initial resistance minimum (RiMIN) | RiMIN | 0.002 | | | Ω | In still air at 25℃ | 3 |
| Maximum device resistance one hour post reflow (R1MAX) | R1MAX | | | 0.01 | Ω | In still air at 25℃, measured one hour post reflow | 3 |
| Maximum continuous voltage (VMAX), 12 V variant | VMAX | | | 12 | V | Continuous voltage at rated current | 3 |
| Maximum fault current (IMAX) | IMAX | | | 50 | A | At rated voltage | 3 |
| Maximum time-to-trip at 27.5 A | | | | 2 | s | At 27.5 A, VMAX, 25℃ | 3 |
| Trip current (IT) | IT | 11 | | | A | 25℃ still air | 3 |
| Hold current (IH) | IH | | | 5.5 | A | 25℃ still air | 3 |
| Operating temperature | | -40 | | 85 | ℃ | Operating temperature | 1 |
| Maximum ambient temperature for storage | | | | 40 | ℃ | Storage only | 8 |
| Maximum relative humidity for storage | | | | 70 | %RH | Storage only | 8 |
| Peak/classification temperature (TP) | TP | | | 260 | ℃ | Pb-free reflow profile | 6 |
| Passive aging resistance change | | -10 | | 10 | % | 85℃, 1000 hours; typical | 5 |
| Humidity aging resistance change | | -5 | | 5 | % | 85℃/85%RH, 100 hours; typical | 5 |
| Thermal shock resistance change | | | -30 | | % | MIL-STD-202 Method 107G, +85℃/-40℃, 20 cycles; typical | 5 |
| Typical power dissipation | PD | | 1.2 | | W | 25℃ still air | 3 |
## 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-nSMD550L-12`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `jk-nsmd550l-12-etched.step` / `jk-nsmd550l-12-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `jk-nsmd550l-12.step` / `jk-nsmd550l-12.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/8590455858615656448) (8 pp, sha256 `65357ef49c2d2f91`, 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-nsmd550l-12-datasheet.pdf)