# MF-ASML020

**BOURNS** · Resettable Fuses · 0402

MF-ASML020 from BOURNS, in a 0402. 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 | BOURNS |
| Package | 0402 |
| 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 resistance at 23 °C (Rmin) | Rmin | 0.1 |  |  | Ω | at 23 °C, still air | 1 |
| Maximum resistance at 23 °C (R1max) | R1max |  |  | 1.6 | Ω | at 23 °C | 1 |
| Maximum time to trip |  |  |  | 1 | s | At 1.0 A, Vmax, 23 °C, still air | 1 |
| Passive aging resistance change |  | -10 |  | 10 | % | +85 °C, 1000 hours; typical resistance change | 1 |
| Humidity aging resistance change |  | -30 |  | 30 | % | +85 °C, 85 % R.H., 24 hours; typical resistance change | 1 |
| Thermal shock resistance change |  | -30 |  | 30 | % | -40 °C to +85 °C, 20 times; typical resistance change | 1 |
| Maximum voltage | Vmax |  |  | 6 | V |  | 1 |
| Maximum interrupt current | Imax |  |  | 50 | A |  | 1 |
| Operating temperature |  | -40 |  | 85 | °C |  | 1 |
| Hold current | Ihold |  | 0.2 |  | A | at 23 °C | 1 |
| Trip current | Itrip |  | 0.5 |  | A | at 23 °C | 1 |
| Tripped power dissipation |  |  | 0.5 |  | W | at 23 °C | 1 |
| Hold current derating | Ihold |  | 0.32 |  | A | Ambient -40 °C | 2 |
| Hold current derating | Ihold |  | 0.28 |  | A | Ambient -20 °C | 2 |
| Hold current derating | Ihold |  | 0.24 |  | A | Ambient 0 °C | 2 |
| Hold current derating | Ihold |  | 0.2 |  | A | Ambient 23 °C | 2 |
| Hold current derating | Ihold |  | 0.16 |  | A | Ambient 40 °C | 2 |
| Hold current derating | Ihold |  | 0.14 |  | A | Ambient 50 °C | 2 |
| Hold current derating | Ihold |  | 0.12 |  | A | Ambient 60 °C | 2 |
| Hold current derating | Ihold |  | 0.1 |  | A | Ambient 70 °C | 2 |
| Hold current derating | Ihold |  | 0.08 |  | A | Ambient 85 °C | 2 |

## CAD (KiCad official)

- Symbol: `MF-ASML020`
- Footprint: `Fuse:Fuse_0402_1005Metric`
- 3D model: 0402 (KiCad packages3D, STEP)
- 3D model files: `mf-asml020-etched.step` / `mf-asml020-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mf-asml020.step` / `mf-asml020.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/8583640582753697792) (6 pp, sha256 `53c7ba6c9ff953c5`, retrieved 2026-10-18, 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/mf-asml020-datasheet.pdf)