# BSMD1812-260-8V

**BHFUSE** · Resettable Fuses · 1812

BSMD1812-260-8V 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 | One terminal of the non-polarized resettable PTC fuse, rated Vmax 8 Vdc, Imax 100 A, Ihold 2.60 A and Itrip 5.20 A at 25°C. |
| 2 | 2 | passive | Other terminal of the non-polarized resettable PTC fuse, rated Vmax 8 Vdc, Imax 100 A, Ihold 2.60 A and Itrip 5.20 A at 25°C. |

## 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 |
|---|---|---|---|---|---|---|---|
| Hold current (Ihold), 25℃ still air | Ihold |  |  | 2.6 | A | 25℃ still air; BSMD1812-260-8V | 2 |
| Trip current (Itrip), 25℃ still air | Itrip | 5.2 |  |  | A | 25℃ still air; BSMD1812-260-8V | 2 |
| Minimum resistance, initial (un-soldered) state | Rmin | 0.01 |  |  | Ω | Initial un-soldered state; BSMD1812-260-8V | 2 |
| Maximum resistance at 25℃ one hour after tripping or reflow | R1max |  |  | 0.07 | Ω | 25℃, one hour after tripping or reflow soldering of 260℃ for 20 sec | 2 |
| Typical power dissipated in tripped state (Pd typ.) | Pd |  | 1 |  | W | Tripped state, 25℃ still air | 2 |
| Time to trip |  |  | 2.5 |  | Sec | Time to trip at 8.00 A | 2 |
| Maximum voltage device can withstand without damage at rated current (Vmax) | Vmax |  |  | 8 | Vdc | At rated current (Imax) | 2 |
| Maximum fault current device can withstand without damage at rated voltage (Imax) | Imax |  |  | 100 | A | At rated voltage (Vmax) | 2 |
| Ihold vs ambient temperature | Ihold |  |  | 3.9 | A | Ambient operating temperature -40℃ | 5 |
| Ihold vs ambient temperature | Ihold |  |  | 3.42 | A | Ambient operating temperature -20℃ | 5 |
| Ihold vs ambient temperature | Ihold |  |  | 2.96 | A | Ambient operating temperature 0℃ | 5 |
| Ihold vs ambient temperature | Ihold |  |  | 2.6 | A | Ambient operating temperature 25℃ | 5 |
| Ihold vs ambient temperature | Ihold |  |  | 2.22 | A | Ambient operating temperature 40℃ | 5 |
| Ihold vs ambient temperature | Ihold |  |  | 2.07 | A | Ambient operating temperature 50℃ | 5 |
| Ihold vs ambient temperature | Ihold |  |  | 1.94 | A | Ambient operating temperature 60℃ | 5 |
| Ihold vs ambient temperature | Ihold |  |  | 1.35 | A | Ambient operating temperature 70℃ | 5 |
| Ihold vs ambient temperature | Ihold |  |  | 1 | A | Ambient operating temperature 85℃ | 5 |
| Passive aging resistance change |  | -5 |  | 5 | % | +85℃, 1000 hours; typical | 5 |
| Humidity aging resistance change |  | -5 |  | 5 | % | +85℃, 85% R.H., 168 hours; typical | 5 |
| Thermal shock resistance change |  | -33 |  | 33 | % | +85℃ to -40℃, 20 times; typical | 5 |
| Ambient operating temperature |  | -40 |  | 85 | ℃ | Ambient operating conditions | 5 |
| Maximum surface temperature in tripped state |  |  |  | 125 | ℃ | Device in tripped state | 5 |
| Storage temperature |  | 0 |  | 30 | ℃ | Storage condition, 30%-60%RH | 6 |
| Peak reflow temperature (Tp) | Tp |  |  | 260 | ℃ | Pb-free reflow profile | 6 |
| Time 25℃ to peak temperature |  |  |  | 8 | minutes | Pb-free reflow profile, maximum | 6 |

## CAD (KiCad official)

- Symbol: `BSMD1812-260-8V`
- 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: `bsmd1812-260-8v-etched.step` / `bsmd1812-260-8v-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bsmd1812-260-8v.step` / `bsmd1812-260-8v.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/8588917273969512448) (10 pp, sha256 `a7f7e8936d26d547`, 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/bsmd1812-260-8v-datasheet.pdf)