# MF-MSHT075KX-2

**BOURNS** · Resettable Fuses · 1812

MF-MSHT075KX-2 from BOURNS, 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 the non-polarized PTC resettable fuse (ENIG-plated terminal, 0.30 mm min. width D); MF-MSHT075KX is rated 30 V max, 0.75 A hold and 3.75 A trip at 23 °C. |
| 2 | 2 | passive | Terminal 2 of the non-polarized PTC resettable fuse (ENIG-plated terminal, 0.05 mm min. dimension E); MF-MSHT075KX is rated 40 A max. interrupt current at Vmax. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BOURNS |
| 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 (Vmax) | Vmax |  |  | 30 | V |  | 1 |
| Maximum current (Imax) | Imax |  |  | 40 | A |  | 1 |
| Resistance (R1) | R1 | 0.09 |  | 0.85 | Ω | at 23 °C, still air; R1max measured 24 h post reflow | 1 |
| Maximum time to trip | t_trip |  |  | 5 | s | at 8.0 A, Vmax, 23 °C, still air | 1 |
| Hold current | Ihold |  | 0.75 |  | A | at 23 °C | 1 |
| Trip current | Itrip |  | 3.75 |  | A | at 23 °C | 1 |
| Tripped power dissipation |  |  | 1.5 |  | W | typical | 1 |
| Operating temperature |  | -40 |  | 125 | °C |  | 1 |
| Recommended storage temperature |  |  |  | 40 | °C | Recommended storage, 70 % R.H. max. | 1 |
| Ihold thermal derating at -40 °C ambient | Ihold |  | 1.09 |  | A | ambient -40 °C | 2 |
| Ihold thermal derating at -20 °C ambient | Ihold |  | 0.98 |  | A | ambient -20 °C | 2 |
| Ihold thermal derating at 0 °C ambient | Ihold |  | 0.87 |  | A | ambient 0 °C | 2 |
| Ihold thermal derating at +23 °C ambient | Ihold |  | 0.75 |  | A | ambient +23 °C | 2 |
| Ihold thermal derating at +40 °C ambient | Ihold |  | 0.66 |  | A | ambient +40 °C | 2 |
| Ihold thermal derating at +50 °C ambient | Ihold |  | 0.61 |  | A | ambient +50 °C | 2 |
| Ihold thermal derating at +60 °C ambient | Ihold |  | 0.56 |  | A | ambient +60 °C | 2 |
| Ihold thermal derating at +70 °C ambient | Ihold |  | 0.5 |  | A | ambient +70 °C | 2 |
| Ihold thermal derating at +85 °C ambient | Ihold |  | 0.42 |  | A | ambient +85 °C | 2 |
| Ihold thermal derating at +125 °C ambient | Ihold |  | 0.2 |  | A | ambient +125 °C | 2 |

## CAD (KiCad official)

- Symbol: `MF-MSHT075KX-2`
- 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: `mf-msht075kx-2-etched.step` / `mf-msht075kx-2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mf-msht075kx-2.step` / `mf-msht075kx-2.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BOURNS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603008185091436544) (7 pp, sha256 `4ce172efa9eab263`, 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/mf-msht075kx-2-datasheet.pdf)