# K1206L050

**KUU** · Resettable Fuses · 1206

K1206L050 from KUU, in a 1206. 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 terminal of the resettable PPTC fuse (IH 0.50 A hold, IT 1.00 A trip at 25°C, Vmax 24 V, Imax 40 A), interchangeable with the other terminal. |
| 2 | 2 | passive | Non-polarized terminal of the resettable PPTC fuse (IH 0.50 A hold, IT 1.00 A trip at 25°C, Vmax 24 V, Imax 40 A), interchangeable with the other terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KUU |
| Package | 1206 |
| 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 |
|---|---|---|---|---|---|---|---|
| Holding current (IH) | IH |  |  | 0.5 | A | 25℃ still air | 1 |
| Tripping current (IT) | IT | 1 |  |  | A | 25℃ still air | 1 |
| Maximum voltage (Vmax) | Vmax |  |  | 24 | V | at rated current | 1 |
| Maximum fault current (Imax) | Imax |  |  | 40 | A | at rated voltage | 1 |
| Maximum time to trip (Ttrip) | Ttrip |  |  | 0.1 | S | at 8.00 A | 1 |
| Minimum resistance prior to trip (R min) | R min | 0.15 |  |  | Ω | prior to trip at 25℃ | 1 |
| Maximum resistance one hour post reflow (R1max) | R1max |  |  | 1.1 | Ω | measured one hour post reflow at 25℃ | 1 |
| Average ramp-up rate |  |  |  | 3 | ℃/second | average ramp-up, solder reflow profile | 1 |
| Ramp-down rate |  |  |  | 6 | ℃/second | ramp-down, solder reflow profile | 1 |
| Reflow profile duration |  |  |  | 8 | minutes |  | 1 |
| Rated working power (Pd) | Pd |  | 0.5 |  | W |  | 1 |

## CAD (KiCad official)

- Symbol: `K1206L050`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `k1206l050-etched.step` / `k1206l050-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `k1206l050.step` / `k1206l050.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KUU datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588941080075517952) (1 pp, sha256 `06ffdd5c920d0737`, 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/k1206l050-datasheet.pdf)