# SMD1812-110C-33V

**BNstar** · Resettable Fuses · 1812

SMD1812-110C-33V from BNstar, 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 | BNstar |
| 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 |
|---|---|---|---|---|---|---|---|
| Initial (un-soldered) minimum resistance | Rmin | 0.045 |  |  | Ω | 25℃ | 1 |
| Maximum resistance one hour after reflow | R1max |  |  | 0.25 | Ω | 25℃, measured one hour after reflow soldering of 260℃ for 20 sec | 1 |
| Hold current | IH |  |  | 1.1 | A | 25℃ still air, reflow soldering of 260℃ for 20 sec | 1 |
| Trip current | IT | 2.2 |  |  | A | 25℃ still air, reflow soldering of 260℃ for 20 sec | 1 |
| Maximum continuous voltage | Vmax |  |  | 33 | V | at rated current | 1 |
| Maximum fault current | Imax |  |  | 40 | A | at rated voltage | 1 |
| Maximum time to trip | Ttrip |  |  | 0.3 | S | 25℃, at 8.0 A | 1 |
| Typical power dissipation | Pdtyp |  | 0.8 |  | W | when in state air environment | 1 |
| Hold current derating at ambient -40℃ |  |  |  | 1.6 | A | ambient -40℃ | 2 |
| Hold current derating at ambient -20℃ |  |  |  | 1.45 | A | ambient -20℃ | 2 |
| Hold current derating at ambient 0℃ |  |  |  | 1.28 | A | ambient 0℃ | 2 |
| Hold current derating at ambient 25℃ |  |  |  | 1.1 | A | ambient 25℃ | 2 |
| Hold current derating at ambient 40℃ |  |  |  | 0.92 | A | ambient 40℃ | 2 |
| Hold current derating at ambient 50℃ |  |  |  | 0.83 | A | ambient 50℃ | 2 |
| Hold current derating at ambient 60℃ |  |  |  | 0.71 | A | ambient 60℃ | 2 |
| Hold current derating at ambient 70℃ |  |  |  | 0.66 | A | ambient 70℃ | 2 |
| Hold current derating at ambient 85℃ |  |  |  | 0.52 | A | ambient 85℃ | 2 |
| Recommended storage temperature |  |  |  | 40 | °C | recommended storage conditions | 2 |
| Recommended storage relative humidity |  |  |  | 70 | % R.H. | recommended storage conditions | 2 |

## CAD (KiCad official)

- Symbol: `SMD1812-110C-33V`
- 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: `smd1812-110c-33v-etched.step` / `smd1812-110c-33v-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smd1812-110c-33v.step` / `smd1812-110c-33v.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BNstar datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040386114768897) (3 pp, sha256 `07ff028cd504dad3`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `two-terminal convention` (convention), consensus `off` (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/smd1812-110c-33v-datasheet.pdf)