# DDZX33-13

**Diodes Incorporated** · Zener Diodes · SOT-23

DDZX33-13 from Diodes Incorporated, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model). Symbol and footprint from KiCad-official CAD; the 3D model is generated from the datasheet's package dimensions.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | A | passive | Zener anode, the lower-left terminal in the device schematic; the datasheet gives VZ 32.14 V min to 33.79 V max at IZT = 5 mA for the DDZX33. |
| 2 | NC | unconnected | The lower-right terminal in the device schematic is not connected to the diode. |
| 3 | K | passive | Zener cathode, the single top terminal in the device schematic; the datasheet gives a maximum reverse current of 0.05 µA at VR = 27.0 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-23 |
| Category | Diodes |
| Pins | 3 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Zener voltage | VZ | 32.14 |  | 33.79 | V | @ IZT = 5 mA; measured <40 ms after power supplied (Note 8) | 2 |
| Maximum Zener impedance | ZZT |  |  | 75 | Ω | @ IZT = 5 mA, f = 1 kHz | 2 |
| Maximum Zener impedance (knee) | ZZK |  |  | 250 | Ω | @ IZK = 0.5 mA, f = 1 kHz | 2 |
| Maximum reverse current | IR |  |  | 0.05 | µA | @ VR = 27 V; short pulse test (Note 9) | 2 |
| Power dissipation | PD |  |  | 300 | mW | Device mounted on FR-4 PCB with recommended pad layout (Note 7) | 2 |
| Operating and storage temperature range | TJ, TSTG | -65 |  | 150 | °C |  | 2 |
| Thermal resistance, junction to ambient air | RθJA |  | 417 |  | °C/W | Device mounted on FR-4 PCB with recommended pad layout (Note 7) | 2 |
| Forward voltage | VF |  | 0.9 |  | V | @ IF = 10 mA | 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 |  Terminals: Finish - Matte Tin Annealed over Alloy 42 Leadframe. Solderable per MIL-STD-202, Method 208 | 1 |

## CAD (land: KiCad; 3D: generated from the datasheet)

- Symbol: `DDZX33-13`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23, generated on the KiCad land (body 1.3 x 2.9 mm, terminals on the pads, 1.025 mm tall, datasheet A, nominal). KiCad's stock model for this land is taller than the datasheet allows, so the model is generated from the datasheet drawing; the dimensions come from the datasheet drawing where it was read and are defaults otherwise (see provenance.model_3d_generated), not the manufacturer's CAD (STEP)
- 3D model files: `ddzx33-13-etched.step` / `ddzx33-13-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ddzx33-13.step` / `ddzx33-13.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/DDZX33-13.pdf) (8 pp, sha256 `f1abaaad1d27cb30`, retrieved 2026-11-13, tier: manufacturer)
- **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:** land: KiCad official libraries (CC-BY-SA 4.0); 3D: generated from the datasheet's package dimensions (provenance.model_3d_generated).

[Datasheet PDF](docs/ddzx33-13-datasheet.pdf)