component
SMD1812-050-33
Public Made by Adomby adom
hongjiacheng Resettable Fuses, 1812. Pinout cross-checked by two models against the datasheet, 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
markdownSMD1812-050-33
hongjiacheng · Resettable Fuses · 1812
SMD1812-050-33 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 resettable PTC fuse (Ihold 0.50 A, Itrip 1.0 A, Vmax 33 V, Imax 40 A), with a recommended pad 1.7±0.1 mm wide by 3.5±0.1 mm long. |
| 2 | 2 | passive | The other terminal of the non-polarized resettable PTC fuse, with the pads spaced 3.0±0.1 mm apart on the recommended layout. |
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 | 0.5 | A | Maximum current device will pass without tripping in 25℃ still air | 2 | ||
| Trip current (Itrip) | Itrip | 1 | A | Minimum current at which the device will trip in 25℃ still air | 2 | ||
| Maximum voltage (Vmax) | Vmax | 33 | V | Maximum voltage device can withstand without damage at rated current (Imax) | 2 | ||
| Maximum fault current (Imax) | Imax | 40 | A | Maximum fault current device can withstand without damage at rated voltage (Vmax) | 2 | ||
| Typical power dissipation in tripped state (Pd typ) | Pd | 1 | W | Typical power dissipated from device when in the tripped state at 25℃ still air | 2 | ||
| Maximum time-to-trip | 8 | s | 2 | ||||
| Minimum resistance in initial state (Ri min) | Ri | 0.15 | Ω | Minimum resistance of device in initial (un-soldered) state | 2 | ||
| Maximum resistance at 25℃ after trip or reflow (R1 max) | R1 | 1.4 | Ω | At 25℃, measured one hour after tripping or reflow soldering of 260℃ for 20 sec | 2 | ||
| Operating / storage temperature | -40 | 85 | ℃ | Operating / storage temperature | 5 | ||
| Maximum device surface temperature in tripped state | 125 | ℃ | Maximum device surface temperature in tripped state | 5 | |||
| Peak reflow temperature (TP) | TP | 260 | ℃ | Pb-free reflow; do not exceed +260℃ | 1 |
CAD (KiCad official)
- Symbol:
SMD1812-050-33 - 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:
smd1812-050-33-etched.step/smd1812-050-33-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smd1812-050-33.step/smd1812-050-33.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: hongjiacheng datasheet (6 pp, sha256
8ab1f213bc6d6cd2, retrieved 2026-10-18, 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).