# PSD18C-LF-T7

**ProTek Devices** · TVS · SOD-323

PSD18C-LF-T7 from ProTek Devices, in a SOD-323. 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 | One terminal of the bidirectional TVS line protector (PSD18C, rated stand-off 18.0 V, minimum breakdown 20.0 V at 1 mA, maximum clamping 29.0 V at IP = 1 A per line). |
| 2 | 2 | passive | The other terminal of the bidirectional TVS line protector, which clamps the protected line to the same bidirectional ratings as pin 1 (18.0 V stand-off, 20.0 V minimum breakdown, 29.0 V maximum clamp). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ProTek Devices |
| Package | SOD-323 |
| 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 breakdown voltage | V(BR) | 20 |  |  | V | @ 1mA | 2 |
| Maximum clamping voltage | VC |  |  | 29 | V | @ IP = 1A (Fig. 2) | 2 |
| Maximum leakage current | ID |  |  | 1 | µA | @VWM | 2 |
| Bidirectional peak pulse power | PPP |  |  | 400 | Watts | tp = 8/20µs (See Figure 1) | 2 |
| Operating temperature | TL | -55 |  | 150 | °C |  | 2 |
| Storage temperature | TSTG | -55 |  | 150 | °C |  | 2 |
| Rated stand-off voltage | VWM |  | 18 |  | VOLTS |  | 2 |
| Typical capacitance | C |  | 40 |  | pF | @0V, 1MHz | 2 |

## 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 |  | tin | • Lead-Free Pure-Tin Plating (Annealed) • Solder Reflow Temperature: | 1 |

## CAD (KiCad official)

- Symbol: `PSD18C-LF-T7`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `psd18c-lf-t7-etched.step` / `psd18c-lf-t7-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `psd18c-lf-t7.step` / `psd18c-lf-t7.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ProTek Devices datasheet](docs/psd18c-lf-t7-datasheet.pdf) (10 pp, sha256 `bf219560b9ae3487`, retrieved 2026-11-04, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/psd18c-lf-t7-datasheet.pdf)