# SL1210550

**TECHFUSE** · Resettable Fuses · 1210

SL1210550 from TECHFUSE, in a 1210. 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 | TECHFUSE |
| Package | 1210 |
| 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 (maximum current that does not trip at 25°C) | IH |  |  | 5.5 | A | 25℃ still air; reflow soldering 260℃ for 20 sec | 2 |
| Trip current (minimum current that always trips at 25°C) | IT | 11 |  |  | A | 25℃ still air; reflow soldering 260℃ for 20 sec | 2 |
| Minimum resistance, initial un-soldered state | Rmin | 0.0008 |  |  | Ω | 25℃, initial (un-soldered) state | 2 |
| Maximum resistance, initial un-soldered state | Rmax |  |  | 0.005 | Ω | 25℃, initial (un-soldered) state | 2 |
| Maximum resistance one hour after reflow | R1max |  |  | 0.01 | Ω | 25℃, measured one hour after reflow soldering 260℃ for 20 sec; PWB 0.030 in 1.5 oz copper traces | 2 |
| Maximum continuous voltage (rated voltage) | Vmax |  |  | 6 | V | at rated current | 2 |
| Maximum fault current | Imax |  |  | 50 | A | at rated voltage | 2 |
| Maximum time to trip | Ttrip |  |  | 20 | s | at assigned current; reflow soldering 260℃ for 20 sec | 2 |
| Recommended storage temperature (maximum) |  |  |  | 40 | ℃ | storage, 70% R.H. max | 2 |
| Typical power dissipation | Pdtyp |  | 1.5 |  | W | when in state air environment | 2 |
| Hold current at ambient temperature -40℃ (thermal derating) |  |  | 8.3 |  | A | thermal derating table, ambient -40℃ | 3 |
| Hold current at ambient temperature -20℃ (thermal derating) |  |  | 7.3 |  | A | thermal derating table, ambient -20℃ | 3 |
| Hold current at ambient temperature 0℃ (thermal derating) |  |  | 6.4 |  | A | thermal derating table, ambient 0℃ | 3 |
| Hold current at ambient temperature 25℃ (thermal derating) |  |  | 5.5 |  | A | thermal derating table, ambient 25℃ | 3 |
| Hold current at ambient temperature 40℃ (thermal derating) |  |  | 4.7 |  | A | thermal derating table, ambient 40℃ | 3 |
| Hold current at ambient temperature 50℃ (thermal derating) |  |  | 4.2 |  | A | thermal derating table, ambient 50℃ | 3 |
| Hold current at ambient temperature 60℃ (thermal derating) |  |  | 3.9 |  | A | thermal derating table, ambient 60℃ | 3 |
| Hold current at ambient temperature 70℃ (thermal derating) |  |  | 3.4 |  | A | thermal derating table, ambient 70℃ | 3 |

## CAD (KiCad official)

- Symbol: `SL1210550`
- Footprint: `Fuse:Fuse_1210_3225Metric`
- 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files: `sl1210550-etched.step` / `sl1210550-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sl1210550.step` / `sl1210550.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/8588916336316076032) (5 pp, sha256 `8ae482acc55ca041`, retrieved 2026-10-17, 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/sl1210550-datasheet.pdf)