component
SMD1812-300-6
Public Made by Adomby adom
hongjiacheng Resettable Fuses, 1812. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownSMD1812-300-6
hongjiacheng · Resettable Fuses · 1812
SMD1812-300-6 from hongjiacheng, 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 | One terminal of the non-polarized PTC resettable fuse (Ihold 3.0A, Itrip 6.0A, Vmax 6V, Imax 40A); the device is symmetric and either terminal may be used. |
| 2 | 2 | passive | Second terminal of the non-polarized PTC resettable fuse, in series with terminal 1 (Ri min 0.01Ω, R1 max 0.05Ω). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| 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 | 25℃ still air; maximum current passed without tripping (vocabulary definition) | 3 | ||
| Trip current (Itrip) | Itrip | 6 | A | 25℃ still air; minimum current at which device trips (vocabulary definition) | 3 | ||
| Maximum voltage | Vmax | 6 | V | At rated current (Imax) | 3 | ||
| Maximum fault current | Imax | 40 | A | At rated voltage (Vmax) | 3 | ||
| Power dissipated in tripped state | Pd | 1.2 | W | Typical, tripped state, 25℃ still air | 3 | ||
| Max. time-to-trip | 4 | s | Max. column value 8.0 A as printed in table row | 3 | |||
| Minimum resistance, initial (un-soldered) state | Ri | 0.01 | Ω | Initial un-soldered state, Ta=25℃ | 3 | ||
| Maximum resistance after trip or reflow | R1 | 0.05 | Ω | 25℃, measured one hour after tripping or reflow soldering at 260℃ for 20 sec | 3 | ||
| Operating / storage temperature | -40 | 85 | ℃ | Environmental specification for SMD1812 series | 5 | ||
| Maximum device surface temperature in tripped state | 125 | ℃ | Tripped state | 5 | |||
| Preheat temperature TS(min) | TS(min) | 150 | ℃ | Pb-free reflow profile; printed as +150℃ (min of preheat band) | 1 | ||
| Preheat temperature TS(max) | TS(max) | 200 | ℃ | Pb-free reflow profile | 1 | ||
| Preheat time tS | tS | 60 | 180 | s | Pb-free reflow profile, TS(min) to TS(max) | 1 | |
| Liquidus temperature TL | TL | 217 | ℃ | Pb-free reflow profile | 1 | ||
| Time above liquidus tL | tL | 60 | 150 | s | Pb-free reflow profile | 1 | |
| Peak temperature TP | TP | 260 | ℃ | Pb-free reflow; printed +260(+0/-5)℃; do not exceed +260℃ | 1 | ||
| Time within 5℃ of peak temperature tP | tP | 20 | 40 | s | Pb-free reflow profile | 1 | |
| Ramp-up rate | 3 | ℃/s | TS(max) to TL and average ramp from TL to peak | 1 | |||
| Ramp-down rate | 6 | ℃/s | Peak to end of reflow | 1 | |||
| Time 25℃ to peak temperature | 8 | min | 25℃ to peak temperature | 1 |
CAD (KiCad official)
- Symbol:
SMD1812-300-6 - 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:
smd1812-300-6-etched.step/smd1812-300-6-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smd1812-300-6.step/smd1812-300-6.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: hongjiacheng datasheet (6 pp, sha256
8ab1f213bc6d6cd2, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).