# SMD1210P075TF

**PTTC Polytronics Tech** · Resettable Fuses · 1210

SMD1210P075TF from PTTC Polytronics Tech, 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 the non-polarized PTC device, a solder-plated copper end terminal landing on a 1.00 mm x 2.50 mm pad; the two pads are 2.00 mm apart. |
| 2 | 2 | passive | Terminal 2 of the non-polarized PTC device, a solder-plated copper end terminal landing on a 1.00 mm x 2.50 mm pad; the two pads are 2.00 mm apart. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | PTTC Polytronics Tech |
| 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 resistance (initial, un-soldered) | Rmin | 0.13 |  |  | Ω | Initial un-soldered state | 2 |
| Maximum resistance at 23 ºC after trip or reflow | R1max |  |  | 0.4 | Ω | 23 ºC, measured one hour after tripping or reflow soldering at 260 ºC for 20 sec | 2 |
| Maximum voltage (Vmax) | Vmax |  |  | 6 | Vdc | At rated current (Imax) | 2 |
| Maximum fault current (Imax) | Imax |  |  | 100 | A | At rated voltage (Vmax) | 2 |
| Trip current (Itrip) | Itrip | 1.5 |  |  | A | 23 ºC still air | 2 |
| Hold current (Ihold) | Ihold |  |  | 0.75 | A | Maximum current device will pass without tripping, 23 ºC still air | 2 |
| Maximum time to trip |  |  |  | 0.1 | Sec. | Fault current 8.00 A | 2 |
| Operating temperature |  | -40 |  | 85 | ºC |  | 7 |
| Maximum device surface temperature in tripped state |  |  |  | 125 | ºC | Tripped state | 7 |
| Passive aging resistance change |  | -5 |  | 5 | % | +85 ºC, 1000 hours; typical resistance change | 7 |
| Humidity aging resistance change |  | -5 |  | 5 | % | +85 ºC, 85% R.H., 1000 hours; typical resistance change | 7 |
| Typical power dissipated in tripped state | Pd |  | 0.6 |  | W | Tripped state at 23 ºC still air | 2 |
| Thermal shock resistance change |  |  | -30 |  | % | MIL-STD-202 Method 107G, +85 ºC/-40 ºC, 20 times; typical resistance change | 7 |
| Recommended hold current at ambient -40 ºC |  |  | 1 |  | A | Ambient operation temperature -40 ºC (thermal derating table) | 4 |
| Recommended hold current at ambient 85 ºC |  |  | 0.4 |  | A | Ambient operation temperature 85 ºC (thermal derating table) | 4 |

## 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 Material Solder-Plated Copper (Solder Material: Matte Tin (Sn)) | 8 |

## CAD (KiCad official)

- Symbol: `SMD1210P075TF`
- Footprint: `Fuse:Fuse_1210_3225Metric`
- 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files: `smd1210p075tf-etched.step` / `smd1210p075tf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smd1210p075tf.step` / `smd1210p075tf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [PTTC Polytronics Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588905417930260481) (10 pp, sha256 `23208d6340686af0`, retrieved 2026-10-18, 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/smd1210p075tf-datasheet.pdf)