# SMD1210-175

**TECHFUSE** · Resettable Fuses · 1210

SMD1210-175 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 | Non-polarized terminal pad (tin-plated nickel-copper) of the PPTC; device is rated Vmax 6 Vdc, Imax 100 A, Ihold 1.75 A and Itrip 3.50 A at 25°C. |
| 2 | 2 | passive | Second non-polarized terminal pad of the PPTC, interchangeable with the other pad; resistance is 0.020 Ω min to 0.080 Ω max (R1max) before tripping at 25°C. |

## 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 |
|---|---|---|---|---|---|---|---|
| Minimum device resistance prior to tripping (Rimin) | Rimin | 0.02 |  |  | Ω | 25°C | 1 |
| Maximum device resistance one hour post reflow (R1max) | R1max |  |  | 0.08 | Ω | Measured one hour post reflow | 1 |
| Maximum operating voltage (Vmax) | Vmax |  |  | 6 | Vdc | At rated current (Imax) | 1 |
| Maximum fault current (Imax) | Imax |  |  | 100 | A | At rated voltage (Vmax), 25°C still air | 1 |
| Hold current (Ihold) | Ihold |  |  | 1.75 | A | 25°C still air; maximum current device will not trip | 1 |
| Trip current (Itrip) | Itrip | 3.5 |  |  | A | 25°C still air; minimum current at which device will always trip | 1 |
| Passive aging resistance change |  | -5 |  | 5 | % | +85°C, 1000 hrs; typical | 1 |
| Humidity aging resistance change |  | -5 |  | 5 | % | +85°C, 85% R.H., 168 hours; typical | 1 |
| Thermal shock resistance change |  | -33 |  | 33 | % | +85°C to -40°C, 20 times; typical | 1 |
| Ambient operating temperature |  | -40 |  | 85 | °C |  | 1 |
| Maximum surface temperature in tripped state |  |  |  | 125 | °C | Device in tripped state | 1 |
| Storage temperature |  |  |  | 40 | °C | Storage; 70% R.H. max | 3 |
| Power dissipation in tripped state (Pd) | Pd |  | 0.8 |  | W | Tripped state, 25°C still air, at rated voltage | 1 |
| Maximum time to trip |  |  |  | 0.6 | Sec |  | 1 |
| Typ. Current (unlabeled column) |  |  | 8 |  | A |  | 1 |
| Hold current at -40°C (Ihold vs temperature) | Ihold |  | 2.54 |  | A | Ambient -40°C | 1 |
| Hold current at 85°C (Ihold vs temperature) | Ihold |  | 0.86 |  | A | Ambient 85°C | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | Copper | tin | Terminal pad materials： Tin-plated Nickel-Copper | 2 |

## CAD (KiCad official)

- Symbol: `SMD1210-175`
- Footprint: `Fuse:Fuse_1210_3225Metric`
- 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files: `smd1210-175-etched.step` / `smd1210-175-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smd1210-175.step` / `smd1210-175.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/8588916336302952448) (3 pp, sha256 `94e24d1ec8cd4a77`, 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/smd1210-175-datasheet.pdf)