# SMD1206-025-24

**hongjiacheng** · Resettable Fuses · 1206

SMD1206-025-24 from hongjiacheng, 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 PTC, rated Ihold 0.25 A, Itrip 0.50 A, Vmax 24 V and Imax 40 A. |
| 2 | 2 | passive | Second terminal of the non-polarized PTC, which is interchangeable with the first and uses a 1.2±0.1 mm x 1.9±0.1 mm recommended pad. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| 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 (Ihold), maximum | Ihold |  |  | 0.25 | A | 25℃ still air; max current device passes without tripping | 2 |
| Trip current (Itrip), minimum | Itrip | 0.5 |  |  | A | 25℃ still air; min current at which device trips | 2 |
| Maximum voltage (Vmax) | Vmax |  |  | 24 | V | At rated current (Imax) | 2 |
| Maximum fault current (Imax) | Imax |  |  | 40 | A | At rated voltage (Vmax) | 2 |
| Minimum resistance in initial (un-soldered) state (Ri min) | Ri min | 0.35 |  |  | Ω | Initial un-soldered state | 2 |
| Maximum resistance at 25℃ (R1 max) | R1 max |  |  | 2.5 | Ω | 25℃, measured one hour after tripping or reflow soldering of 260℃ for 20 sec | 3 |
| Time-to-trip (column header 'Max. Time-to-trip') |  |  |  | 0.1 | Sec | Test conditions not printed in table; Fig.2 average time-current curve (family) | 2 |
| Power dissipated in tripped state (Pd typ) | Pd typ |  | 0.6 |  | W | Tripped state, 25℃ still air | 2 |
| Operating / storage temperature |  | -40 |  | 85 | ℃ | Operating / storage temperature | 4 |
| Maximum device surface temperature in tripped state |  |  |  | 125 | ℃ | Tripped state | 4 |
| Reflow peak temperature (Do not exceed) | TP |  |  | 260 | ℃ | Pb-free reflow profile; do not exceed +260℃ | 1 |
| Hold current derating at -40℃ (family SMD1206-025 chart) | Ihold |  | 0.37 |  | A | Ambient -40℃; derating chart row SMD1206-025 (no suffix) | 4 |
| Hold current derating at 85℃ (family SMD1206-025 chart) | Ihold |  | 0.12 |  | A | Ambient 85℃; derating chart row SMD1206-025 (no suffix) | 4 |

## CAD (KiCad official)

- Symbol: `SMD1206-025-24`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `smd1206-025-24-etched.step` / `smd1206-025-24-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smd1206-025-24.step` / `smd1206-025-24.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [hongjiacheng datasheet](docs/smd1206-025-24-datasheet.pdf) (6 pp, sha256 `ac89288fcdc8403c`, 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/smd1206-025-24-datasheet.pdf)