component
SMD1812P300TFT
Public Made by Adomby adom
PTTC Polytronics Tech 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
markdownSMD1812P300TFT
PTTC Polytronics Tech · Resettable Fuses · 1812
SMD1812P300TFT from PTTC Polytronics Tech, 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 | PTTC Polytronics Tech |
| 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 |
|---|---|---|---|---|---|---|---|
| Hold current (Ihold) | Ihold | 3 | A | 23 ºC still air; maximum current passed without tripping | 3 | ||
| Trip current (Itrip) | Itrip | 5 | A | 23 ºC still air; minimum current at which device trips | 3 | ||
| Maximum voltage (Vmax) | Vmax | 6 | Vdc | At rated current (Imax); maximum voltage device withstands without damage | 3 | ||
| Maximum fault current (Imax) | Imax | 100 | A | At rated voltage (Vmax); maximum fault current device withstands without damage | 3 | ||
| Maximum time to trip | 4 | s | At 8.00 A fault current | 3 | |||
| Minimum resistance in initial (un-soldered) state (Rmin) | Rmin | 0.012 | Ω | Initial un-soldered state | 3 | ||
| Maximum resistance after trip or reflow (R1max) | R1max | 0.04 | Ω | 23 ºC, measured 1 h after tripping or 260 ºC reflow for 20 s; PWB with 0.030in*1.5oz copper traces | 3 | ||
| Power dissipated in tripped state (Pd) | Pd | 0.8 | W | Typical, tripped state at 23 ºC still air | 3 | ||
| Operating temperature | -40 | 85 | ºC | Environmental specifications | 11 | ||
| Maximum device surface temperature in tripped state | 125 | ºC | Tripped state | 11 | |||
| Storage temperature | 0 | 35 | ºC | Storage condition | 9 | ||
| Storage humidity | 70 | %RH | Storage condition; glyph printed as 'ʀ' read as ≤ | 9 | |||
| Passive aging resistance change | -5 | 5 | % | +85 ºC, 1000 hours; typical resistance change, series-level | 11 | ||
| Humidity aging resistance change | -5 | 5 | % | +85 ºC, 85 %RH, 1000 hours; typical resistance change, series-level | 11 | ||
| Thermal shock resistance change | -30 | % | MIL-STD-202 Method 107G, +85 ºC/-40 ºC, 20 cycles; typical resistance change, series-level | 11 | |||
| Recommended hold current at -40 ºC | Ihold | 4.13 | A | Recommended hold current at ambient -40 ºC | 6 | ||
| Recommended hold current at -20 ºC | Ihold | 3.75 | A | Recommended hold current at ambient -20 ºC | 6 | ||
| Recommended hold current at 0 ºC | Ihold | 3.3 | A | Recommended hold current at ambient 0 ºC | 6 | ||
| Recommended hold current at 23 ºC | Ihold | 3 | A | Recommended hold current at ambient 23 ºC | 6 | ||
| Recommended hold current at 40 ºC | Ihold | 2.62 | A | Recommended hold current at ambient 40 ºC | 6 | ||
| Recommended hold current at 50 ºC | Ihold | 2.43 | A | Recommended hold current at ambient 50 ºC | 6 | ||
| Recommended hold current at 60 ºC | Ihold | 2.25 | A | Recommended hold current at ambient 60 ºC | 6 | ||
| Recommended hold current at 70 ºC | Ihold | 2 | A | Recommended hold current at ambient 70 ºC | 6 | ||
| Recommended hold current at 85 ºC | Ihold | 1.78 | A | Recommended hold current at ambient 85 ºC | 6 |
CAD (KiCad official)
- Symbol:
SMD1812P300TFT - 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:
smd1812p300tft-etched.step/smd1812p300tft-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smd1812p300tft.step/smd1812p300tft.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: PTTC Polytronics Tech datasheet (15 pp, sha256
fd56e0378b967ec7, retrieved 2026-10-13, 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).