# SMD1812-150C-33V

**BNstar** · Resettable Fuses · 1812

SMD1812-150C-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 | First terminal of the non-polarized resettable PTC fuse, rated 1.5 A hold, 3.0 A trip at 25℃, Vmax 33.0 V, Imax 50 A. |
| 2 | 2 | passive | Second terminal of the non-polarized resettable PTC fuse, rated 1.5 A hold, 3.0 A trip at 25℃, Vmax 33.0 V, Imax 50 A. |

## 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 voltage (rated voltage) | Vmax |  |  | 33 | V | Maximum continuous voltage device can withstand without damage at rated current | 1 |
| Maximum fault current | Imax |  |  | 50 | A | Withstood without damage at rated voltage | 1 |
| Minimum resistance, initial (un-soldered) | Rmin | 0.04 |  |  | Ω | 25℃, initial un-soldered state | 1 |
| Maximum resistance after reflow | R1max |  |  | 0.18 | Ω | 25℃, measured one hour after reflow soldering of 260℃ for 20 sec | 1 |
| Trip current | IT | 3 |  |  | A | 25℃ still air, reflow soldering of 260℃ for 20 sec | 1 |
| Hold current | IH |  |  | 1.5 | A | 25℃ still air, reflow soldering of 260℃ for 20 sec | 1 |
| Maximum time to trip | Ttrip |  |  | 0.5 | s | At 8.0 A, 25℃ | 1 |
| Typical power dissipation | Pdtyp |  | 1 |  | W | 25℃, device in tripped state, still air | 1 |
| Maximum ambient operating temperature range |  | -40 |  | 85 | ℃ | Thermal derating table range for hold current | 2 |
| Recommended storage temperature |  |  |  | 40 | ℃ | Recommended storage, 70% R.H. max | 2 |

## CAD (KiCad official)

- Symbol: `SMD1812-150C-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: `smd1812-150c-33v-etched.step` / `smd1812-150c-33v-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smd1812-150c-33v.step` / `smd1812-150c-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/8589836934311936000) (3 pp, sha256 `b353e2be1f2a8af6`, retrieved 2026-10-18, 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/smd1812-150c-33v-datasheet.pdf)