# F12F3

**TLC Electronic** · Disposable Fuses · 1206

F12F3 from TLC Electronic, 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 | One end-cap terminal of the non-polarized 3A fast-acting fuse (72V DC rated, 50A breaking capacity at 72Vdc, 48 mOhm typical cold resistance). |
| 2 | 2 | passive | Other end-cap terminal of the non-polarized 3A fast-acting fuse (72V DC rated, 50A breaking capacity at 72Vdc, 48 mOhm typical cold resistance). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TLC Electronic |
| 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 |
|---|---|---|---|---|---|---|---|
| Opening time at rated current 1.0In (min) |  | 4 |  |  | hour | Rated Current 1.0In, 3A part | 2 |
| Opening time at rated current 2.5In (max) |  |  |  | 5 | sec | Rated Current 2.5In, 3A part | 2 |
| Rated voltage DC |  |  |  | 72 | V | Part No F12F3 | 2 |
| Operating temperature |  | -55 |  | 125 | ℃ | with proper correction factor applied | 5 |
| Wave solder reservoir temperature |  |  |  | 260 | ℃ | Wave solder, reservoir temperature | 4 |
| Wave solder time in reservoir |  |  |  | 10 | seconds | Wave solder, time in reservoir | 4 |
| Infrared reflow temperature |  |  |  | 260 | ℃ | Infrared reflow | 4 |
| Infrared reflow time |  |  |  | 30 | seconds | Infrared reflow, time | 4 |
| Preheat and soak temperature min (Tsmin) | Tsmin | 150 |  |  | ℃ | Lead (Pb) free solder reflow profile | 4 |
| Preheat and soak temperature max (Tsmax) | Tsmax |  |  | 200 | ℃ | Lead (Pb) free solder reflow profile | 4 |
| Preheat and soak time (Tsmin to Tsmax) | tS | 60 |  | 120 | Seconds | Lead (Pb) free solder reflow profile | 4 |
| Average ramp up rate Tsmax to Tp |  |  |  | 3 | ℃ / Second | Lead (Pb) free solder reflow profile | 5 |
| Time at liquidous | tL | 60 |  | 150 | Seconds | Lead (Pb) free solder reflow profile | 5 |
| Peak package body temperature | TP |  |  | 260 | ℃ | Lead (Pb) free solder reflow profile | 5 |
| Time (tP) within 5℃ of classification temperature (TC) | tP |  |  | 30 | Seconds | within 5℃ of the specified classification temperature (TC) | 5 |
| Average ramp-down rate (TP to Tsmax) |  |  |  | 6 | ℃ / Second | Lead (Pb) free solder reflow profile | 5 |
| Time from 25℃ to peak temperature |  |  |  | 8 | Minutes | Lead (Pb) free solder reflow profile | 5 |
| Rated current |  |  | 3 |  | A | Part No F12F3 (3A rating) | 2 |
| DC breaking capacity |  |  | 50 |  | A | @72Vdc; measured at rated voltage, time constant of less than 50 microseconds, battery source | 2 |
| Typical cold resistance |  |  | 48 |  | mOhms | measured at <10% of rated current in ambient temperature of 25℃ | 2 |
| Typical voltage drop |  |  | 187 |  | mV |  | 2 |
| Typical pre-arcing I2t | I2t |  | 1.39 |  | A2Sec | measured at 10In current | 2 |

## CAD (KiCad official)

- Symbol: `F12F3`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `f12f3-etched.step` / `f12f3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `f12f3.step` / `f12f3.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TLC Electronic datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590207940218159104) (5 pp, sha256 `c2cfcade5bcf6391`, 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/f12f3-datasheet.pdf)