# BSMD1812-010-30V

**BHFUSE** · Resettable Fuses · 1812

BSMD1812-010-30V from BHFUSE, 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 PTC terminal; device rated Ihold 0.10 A, Itrip 0.30 A, Vmax 30 Vdc, Imax 40 A, interchangeable with terminal 2. |
| 2 | 2 | passive | Non-polarized PTC terminal; device rated Ihold 0.10 A, Itrip 0.30 A, Vmax 30 Vdc, Imax 40 A, interchangeable with terminal 1. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BHFUSE |
| 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 |
|---|---|---|---|---|---|---|---|
| Minimum initial resistance (Rmin) | Rmin | 0.75 |  |  | Ω | Initial (un-soldered) state | 1 |
| Maximum resistance after trip or reflow (R1max) | R1max |  |  | 15 | Ω | 25°C, measured one hour after tripping or reflow soldering at 260°C for 20 s | 1 |
| Hold current (Ihold) | Ihold |  |  | 0.1 | A | Maximum current passed without tripping, 25°C still air | 1 |
| Trip current (Itrip) | Itrip | 0.3 |  |  | A | Minimum current at which device trips, 25°C still air | 1 |
| Maximum voltage (Vmax) | Vmax |  |  | 30 | Vdc | Maximum voltage device can withstand without damage at rated current (Imax) | 1 |
| Maximum fault current (Imax) | Imax |  |  | 40 | A | Maximum fault current device can withstand without damage at rated voltage (Vmax) | 1 |
| Typical power dissipated in tripped state (Pd typ) | Pd |  | 0.8 |  | W | Tripped state, 25°C still air | 1 |
| Passive aging resistance change |  | -5 |  | 5 | % | +85°C, 1000 hours | 5 |
| Humidity aging resistance change |  | -5 |  | 5 | % | +85°C, 85% R.H., 168 hours | 5 |
| Thermal shock resistance change |  | -33 |  | 33 | % | +85°C to -40°C, 20 cycles | 5 |
| Ambient operating temperature | Ta | -40 |  | 85 | °C | Ambient operating conditions | 5 |
| Maximum surface temperature in tripped state |  |  |  | 125 | °C | Device in tripped state | 5 |

## CAD (KiCad official)

- Symbol: `BSMD1812-010-30V`
- 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: `bsmd1812-010-30v-etched.step` / `bsmd1812-010-30v-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bsmd1812-010-30v.step` / `bsmd1812-010-30v.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BHFUSE datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602695819804098560) (10 pp, sha256 `a7f7e8936d26d547`, retrieved 2026-10-17, 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/bsmd1812-010-30v-datasheet.pdf)