# FSMD020-R

**Fuzetec Tech** · Resettable Fuses · 1812

FSMD020-R from Fuzetec Tech, 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 of two interchangeable, non-polarized termination pads (pure tin) of the FSMD020-R PPTC fuse, rated 0.20 A hold, 0.40 A trip, 30 VDC max, 100 A max fault current. |
| 2 | 2 | passive | The other interchangeable, non-polarized termination pad (pure tin) of the FSMD020-R PPTC fuse. The recommended solder pad is 1.78 mm wide (B) with 3.45 mm spacing (A) and 3.50 mm length (C). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Fuzetec Tech |
| 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 |
|---|---|---|---|---|---|---|---|
| Trip current | IT | 0.4 |  |  | A | 23℃ still air; minimum current at which device always trips | 1 |
| Hold current | IH |  |  | 0.2 | A | 23℃ still air; maximum current at which device will not trip | 1 |
| Rated voltage | VMAX |  |  | 30 | VDC | Maximum voltage device can withstand without damage at rated current (IMAX) | 1 |
| Max current | IMAX |  |  | 100 | A | Maximum fault current device can withstand without damage at rated voltage (VMAX) | 1 |
| Minimum resistance | RMIN | 0.8 |  |  | Ohms | 23℃ prior to tripping | 1 |
| Maximum resistance after trip | R1MAX |  |  | 5 | Ohms | 23℃, measured 1 hour after tripping or reflow soldering of 260℃ for 20 seconds | 1 |
| Max time to trip |  |  |  | 0.02 | Sec | At 8.0 A fault current, 23℃ still air | 1 |
| Typical power dissipated when tripped | Pd |  | 0.8 |  | W | Tripped state, 23℃ still air | 1 |
| Operating temperature range |  | -40 |  | 85 | ℃ | Temperature range as stated in product summary | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | Terminal pad material: Pure Tin Soldering characteristics: Meets EIA specification RS 186-9E, ANSI/J-std-002 Category 3 | 4 |

## CAD (KiCad official)

- Symbol: `FSMD020-R`
- 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: `fsmd020-r-etched.step` / `fsmd020-r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fsmd020-r.step` / `fsmd020-r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Fuzetec Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588906562715070464) (6 pp, sha256 `c76fe9421a58a972`, retrieved 2026-10-19, 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/fsmd020-r-datasheet.pdf)