# SL1206400

**TECHFUSE** · Resettable Fuses · 1206

SL1206400 from TECHFUSE, 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 | First terminal of the non-polarized resettable PTC fuse, with 4.00 A hold current, 8.0 A trip current and 6.0 V maximum voltage at 25°C. |
| 2 | 2 | passive | Second terminal of the non-polarized resettable PTC fuse, interchangeable with the first, with 50 A maximum fault current at rated voltage. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECHFUSE |
| 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 |
|---|---|---|---|---|---|---|---|
| Hold current | IH |  |  | 4 | A | 25℃ or 60℃ still air; reflow soldering 260℃ for 20 sec | 2 |
| Trip current | IT | 8 |  |  | A | 25℃ still air; reflow soldering 260℃ for 20 sec | 2 |
| Maximum continuous voltage | Vmax |  |  | 6 | V | At rated current | 2 |
| Maximum fault current | Imax |  |  | 50 | A | At rated voltage | 2 |
| Maximum time to trip | Ttrip |  |  | 5 | s | At 16.0 A assigned current; reflow soldering 260℃ for 20 sec | 2 |
| Minimum resistance (initial, un-soldered) | Rmin | 0.001 |  |  | Ω | Initial (un-soldered) state | 2 |
| Maximum resistance (initial, un-soldered) | Rmax |  |  | 0.007 | Ω | Initial (un-soldered) state | 2 |
| Maximum resistance after reflow | R1max |  |  | 0.018 | Ω | 25℃, one hour after reflow soldering 260℃ for 20 sec; PWB with 1.5oz copper traces | 2 |
| Resistance change after vibration |  | -5 |  | 5 | % | MIL-STD-883C Method 2007.1 Condition A | 2 |
| Recommended storage temperature |  |  |  | 40 | ℃ | Recommended storage conditions | 2 |
| Recommended storage humidity |  |  |  | 70 | % R.H. | Recommended storage conditions | 2 |
| Typical power dissipation | Pdtyp |  | 1.5 |  | W | Tripped state, still air environment | 2 |
| Hold current at ambient temperature -40℃ | IH |  | 5.4 |  | A | Maximum ambient operating temperature -40℃ (derating table) | 3 |
| Hold current at ambient temperature -20℃ | IH |  | 4.7 |  | A | Maximum ambient operating temperature -20℃ (derating table) | 3 |
| Hold current at ambient temperature 0℃ | IH |  | 4.3 |  | A | Maximum ambient operating temperature 0℃ (derating table) | 3 |
| Hold current at ambient temperature 25℃ | IH |  | 4 |  | A | Maximum ambient operating temperature 25℃ (derating table) | 3 |
| Hold current at ambient temperature 40℃ | IH |  | 3.3 |  | A | Maximum ambient operating temperature 40℃ (derating table) | 3 |
| Hold current at ambient temperature 50℃ | IH |  | 3 |  | A | Maximum ambient operating temperature 50℃ (derating table) | 3 |
| Hold current at ambient temperature 60℃ | IH |  | 2.7 |  | A | Maximum ambient operating temperature 60℃ (derating table) | 3 |
| Hold current at ambient temperature 70℃ | IH |  | 2.3 |  | A | Maximum ambient operating temperature 70℃ (derating table) | 3 |

## CAD (KiCad official)

- Symbol: `SL1206400`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `sl1206400-etched.step` / `sl1206400-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sl1206400.step` / `sl1206400.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECHFUSE datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588917284157206528) (4 pp, sha256 `cf3d6cb18e8e5a3e`, 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/sl1206400-datasheet.pdf)