# SMD1812-050C-9V

**BNstar** · Resettable Fuses · 1812

SMD1812-050C-9V 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 |
|---|---|---|---|---|---|---|---|
| Maximum resistance at 25℃ (one hour after reflow) | R1max |  |  | 1.4 | Ω | 25℃, measured one hour after reflow soldering of 260℃ for 20 sec | 1 |
| Minimum resistance in initial (un-soldered) state | Rmin | 0.15 |  |  | Ω | Initial (un-soldered) state, 25℃ | 1 |
| Trip current | IT | 1 |  |  | A | 25℃ still air, reflow soldering of 260℃ for 20 sec | 1 |
| Hold current | IH |  |  | 0.5 | A | 25℃ still air, reflow soldering of 260℃ for 20 sec | 1 |
| Maximum continuous voltage | Vmax |  |  | 9 | V | At rated current | 1 |
| Maximum fault current | Imax |  |  | 40 | A | At rated voltage | 1 |
| Maximum time to trip | Ttrip |  |  | 0.15 | s | At assigned current 8.00 A (column reading, see review_required) | 1 |
| Maximum ambient operating temperature range |  | -40 |  | 85 | ℃ | Thermal derating table ambient range | 2 |
| Recommended storage temperature |  |  |  | 40 | ℃ | Recommended storage conditions | 2 |
| Recommended storage relative humidity |  |  |  | 70 | % R.H. | Recommended storage conditions | 2 |
| Typical power dissipation | Pdtyp |  | 0.8 |  | W | In still air environment | 1 |

## CAD (KiCad official)

- Symbol: `SMD1812-050C-9V`
- 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: `smd1812-050c-9v-etched.step` / `smd1812-050c-9v-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smd1812-050c-9v.step` / `smd1812-050c-9v.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/8603382458255618048) (3 pp, sha256 `33a5ad86c1c0357e`, retrieved 2026-10-17, 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/smd1812-050c-9v-datasheet.pdf)