# SMD1812-035-30

**hongjiacheng** · Resettable Fuses · 1812

SMD1812-035-30 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 | Non-polarized PPTC terminal; device holds 0.35A (Ihold), trips at 0.75A (Itrip), and is rated 30V Vmax at 40A Imax. |
| 2 | 2 | passive | Non-polarized PPTC terminal; device holds 0.35A (Ihold), trips at 0.75A (Itrip), and is rated 30V Vmax at 40A Imax. |

## 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 |
|---|---|---|---|---|---|---|---|
| Max. time-to-trip |  |  |  | 8 | Sec |  | 2 |
| Minimum resistance in initial (un-soldered) state | Ri | 0.15 |  |  | Ω | initial (un-soldered) state | 2 |
| Maximum voltage device can withstand without damage at rated current (Imax) | Vmax |  |  | 30 | V | at rated current (Imax) | 2 |
| Maximum fault current device can withstand without damage at rated voltage (Vmax) | Imax |  |  | 40 | A | at rated voltage (Vmax) | 2 |
| Trip current (minimum current at which the device will trip) | Itrip | 0.75 |  |  | A | 25℃ still air | 2 |
| Hold current (maximum current device will pass without tripping) | Ihold |  |  | 0.35 | A | 25℃ still air | 2 |
| Typical power dissipated when in tripped state | Pd |  | 0.8 |  | W | tripped state, 25℃ still air | 2 |
| Operating / Storage temperature |  | -40 |  | 85 | ℃ |  | 5 |
| Maximum device surface temperature in tripped state |  |  |  | 125 | ℃ | tripped state | 5 |

## CAD (KiCad official)

- Symbol: `SMD1812-035-30`
- 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: `smd1812-035-30-etched.step` / `smd1812-035-30-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smd1812-035-30.step` / `smd1812-035-30.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [hongjiacheng datasheet](docs/smd1812-035-30-datasheet.pdf) (6 pp, sha256 `8ab1f213bc6d6cd2`, retrieved 2026-10-19, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-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).

[Datasheet PDF](docs/smd1812-035-30-datasheet.pdf)