component
1812L300MR
Public Made by Adomby adom
Littelfuse 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.
Generated by kicad-footprint-generator · KiCad file format 20260206
| Name | Last updated |
|---|---|
| docs | 5d ago |
| viewers | 5d ago |
| 1812l300mr-etched.glb | 5d ago |
| 1812l300mr-etched.step | 5d ago |
| 1812l300mr-hero.glb | 5d ago |
| 1812l300mr-hero.overlay.json | 5d ago |
| 1812l300mr.glb | 5d ago |
| 1812l300mr.kicad_mod | 5d ago |
| 1812l300mr.kicad_sym | 5d ago |
| 1812l300mr.lbr | 5d ago |
| 1812l300mr.step | 5d ago |
| package.json | 5d ago |
| page.json | 5d ago |
| README.md | 5d ago |
1812L300MR
Littelfuse · Resettable Fuses · 1812
1812L300MR from Littelfuse, 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 | Littelfuse |
| 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 |
|---|---|---|---|---|---|---|---|
| Minimum resistance in initial (un-soldered) state | R min | 0.012 | Ω | 2 | |||
| Maximum resistance at 20°C one hour after tripping or reflow | R 1max | 0.04 | Ω | 20°C, measured one hour after tripping or reflow soldering of 260°C for 20 sec | 2 | ||
| Maximum voltage device can withstand without damage at rated current | V max | 6 | Vdc | at rated current (I max) | 2 | ||
| Maximum fault current device can withstand without damage at rated voltage | I max | 100 | A | at rated voltage (V max) | 2 | ||
| Max. Time To Trip | 4 | Sec. | at 8.00 A current | 2 | |||
| Operating/Storage Temperature | -40 | 85 | °C | Operating/Storage Temp. | 3 | ||
| Max. Device Surface Temp. in Tripped State | 125 | °C | in tripped state | 3 | |||
| Passive aging resistance change | -5 | 5 | % | +85°C, 1000 hours; -/+5% typical resistance change | 3 | ||
| Humidity aging resistance change | -5 | 5 | % | +85°C, 85% R.H., 1000 hours; -/+5% typical resistance change | 3 | ||
| Hold current (maximum current device will pass without tripping) | I hold | 3 | A | 20°C still air | 2 | ||
| Trip current (minimum current at which device will trip) | I trip | 5 | A | 20°C still air | 2 | ||
| Power dissipated from device in tripped state | P d | 0.8 | W | tripped state at 20°C still air | 2 | ||
| Thermal shock resistance change | -30 | % | MIL-STD-202, Method 107, +85°C/-40°C 20 times; typical resistance change | 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 | Terminal Material Solder-Plated Copper (Solder Material: | 3 |
CAD (KiCad official)
- Symbol:
1812L300MR - 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:
1812l300mr-etched.step/1812l300mr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1812l300mr.step/1812l300mr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (7 pp, sha256
6208de21968a51c9, retrieved 2026-10-17, 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).