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JSMD1812-300
Public Made by Adomby adom
Shenzhen Jinkaisheng Elec Resettable Fuses, 1812. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownJSMD1812-300
Shenzhen Jinkaisheng Elec · Resettable Fuses · 1812
JSMD1812-300 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 1 of an unpolarised fuse; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised fuse; either orientation. |
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 at rated current | V max | 6 | V dc | At rated current (Imax) | 2 | ||
| Maximum fault current at rated voltage | I max | 100 | A | At rated voltage (Vmax) | 2 | ||
| Hold current | I hold | 3 | A | 25°C still air; maximum current device will not trip | 2 | ||
| Trip current | I trip | 5 | A | 25°C still air; minimum current at which device will always trip | 2 | ||
| Minimum device resistance prior to tripping | Ri min | 0.012 | Ω | At 25°C | 2 | ||
| Maximum device resistance one hour post reflow | R1max | 0.04 | Ω | Measured one hour post reflow | 2 | ||
| Resistance change, passive aging | -5 | 5 | % | +85°C, 1000 hrs; typical | 2 | ||
| Resistance change, humidity aging | -5 | 5 | % | +85°C, 85% R.H., 168 hours; typical | 2 | ||
| Resistance change, thermal shock | -33 | 33 | % | +85°C to -40°C, 20 times; typical | 2 | ||
| Ambient operating temperature | -40 | 85 | °C | Ambient operating conditions | 2 | ||
| Maximum surface temperature in tripped state | 125 | °C | Device in the tripped state | 2 | |||
| Storage temperature | 0 | 35 | °C | Storage condition | 4 | ||
| Storage relative humidity | 70 | %RH | Storage condition | 4 | |||
| Peak temperature (reflow) | Tp | 260 | ℃ | Pb-free reflow profile | 4 | ||
| Average ramp-up rate (Ts max to Tp) | 3 | ℃/second | Pb-free reflow profile | 4 | |||
| Ramp-down rate | 6 | ℃/second | Pb-free reflow profile | 4 | |||
| Time 25°C to peak temperature | 8 | minutes | Pb-free reflow profile | 4 | |||
| Preheat temperature | Ts | 150 | 200 | ℃ | Pb-free reflow profile | 4 | |
| Preheat time | 60 | 180 | seconds | Ts min to Ts max, Pb-free reflow profile | 4 | ||
| Time maintained above liquidus | tL | 60 | 150 | seconds | Above TL = 217℃ | 4 | |
| Power dissipation in tripped state | Pd | 0.8 | W | Tripped state, 25°C still air, at rated voltage | 2 | ||
| Time to trip | 4 | Sec | Time-to-trip column at 8.0 A | 2 | |||
| Recommended hold current at ambient -40°C | 4.15 | A | Ambient temperature -40°C | 3 | |||
| Recommended hold current at ambient -20°C | 3.76 | A | Ambient temperature -20°C | 3 | |||
| Recommended hold current at ambient 0°C | 3.46 | A | Ambient temperature 0°C | 3 | |||
| Recommended hold current at ambient 25°C | 3 | A | Ambient temperature 25°C | 3 | |||
| Recommended hold current at ambient 40°C | 2.55 | A | Ambient temperature 40°C | 3 | |||
| Recommended hold current at ambient 50°C | 2.28 | A | Ambient temperature 50°C | 3 | |||
| Recommended hold current at ambient 60°C | 2.01 | A | Ambient temperature 60°C | 3 | |||
| Recommended hold current at ambient 70°C | 1.61 | A | Ambient temperature 70°C | 3 | |||
| Recommended hold current at ambient 85°C | 1.33 | A | Ambient temperature 85°C | 3 |
CAD (KiCad official)
- Symbol:
JSMD1812-300 - 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:
jsmd1812-300-etched.step/jsmd1812-300-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);jsmd1812-300.step/jsmd1812-300.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shenzhen Jinkaisheng Elec datasheet (8 pp, sha256
405a37f2a5706ff3, retrieved 2026-10-15, 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).