# SL1210300

**TECHFUSE** · Resettable Fuses · 1210

SL1210300 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 |
|---|---|---|---|---|---|---|---|
| Thermal derating hold current at ambient -40 ℃ |  |  |  | 4.5 | A | Maximum ambient operating temperature -40 ℃ | 3 |
| Thermal derating hold current at ambient -20 ℃ |  |  |  | 4 | A | Maximum ambient operating temperature -20 ℃ | 3 |
| Thermal derating hold current at ambient 0 ℃ |  |  |  | 3.5 | A | Maximum ambient operating temperature 0 ℃ | 3 |
| Thermal derating hold current at ambient 25 ℃ |  |  |  | 3 | A | Maximum ambient operating temperature 25 ℃ | 3 |
| Thermal derating hold current at ambient 40 ℃ |  |  |  | 2.6 | A | Maximum ambient operating temperature 40 ℃ | 3 |
| Thermal derating hold current at ambient 50 ℃ |  |  |  | 2.3 | A | Maximum ambient operating temperature 50 ℃ | 3 |
| Thermal derating hold current at ambient 60 ℃ |  |  |  | 2.1 | A | Maximum ambient operating temperature 60 ℃ | 3 |
| Thermal derating hold current at ambient 70 ℃ |  |  |  | 1.8 | A | Maximum ambient operating temperature 70 ℃ | 3 |
| Maximum hold current (no trip) | IH |  |  | 3 | A | 25℃ still air; reflow soldering 260℃ for 20 sec | 2 |
| Minimum trip current | IT | 6 |  |  | A | 25℃ still air; reflow soldering 260℃ for 20 sec | 2 |
| Maximum continuous voltage (Vmax) | Vmax |  |  | 6 | V | Maximum continuous voltage at rated current | 2 |
| Maximum fault current (Imax) | Imax |  |  | 50 | A | At rated voltage | 2 |
| Typical power dissipation (Pdtyp) | Pdtyp |  | 1.2 |  | W | Typical; air environment | 2 |
| Maximum time to trip (Ttrip) | Ttrip |  |  | 12 | s | At assigned current; reflow soldering 260℃ for 20 sec | 2 |
| Minimum resistance, initial un-soldered state (Rmin) | Rmin | 0.004 |  |  | Ω | 25℃ | 2 |
| Maximum resistance, initial un-soldered state (Rmax) | Rmax |  |  | 0.008 | Ω | 25℃ | 2 |
| Maximum resistance after reflow (R1max) | R1max |  |  | 0.018 | Ω | 25℃, measured one hour after reflow soldering 260℃ for 20 sec | 2 |
| Recommended storage temperature |  |  |  | 40 | ℃ |  | 2 |
| Recommended storage relative humidity |  |  |  | 70 | %R.H. |  | 2 |

## CAD (KiCad official)

- Symbol: `SL1210300`
- Footprint: `Fuse:Fuse_1210_3225Metric`
- 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files: `sl1210300-etched.step` / `sl1210300-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sl1210300.step` / `sl1210300.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/8588916435393654784) (5 pp, sha256 `8ae482acc55ca041`, retrieved 2026-10-18, 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/sl1210300-datasheet.pdf)