# BZX584C3V9Q

**Yangzhou Yangjie Elec Tech** · Zener Diodes · SOD-523(SC-79)

BZX584C3V9Q from Yangzhou Yangjie Elec Tech, in a SOD-523(SC-79). 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 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | SOD-523(SC-79) |
| Category | Diodes |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage | VZ | 3.7 | 3.9 | 4.1 | V | Izt = 5 mA | 2 |
| Zener voltage tolerance |  | -5 |  | 5 | % | approximately (as printed) | 1 |
| Zener dynamic impedance | ZZT |  |  | 90 | Ω | IZT = 5 mA | 2 |
| Zener dynamic impedance at knee | ZZK |  |  | 600 | Ω | IZK = 1.0 mA | 2 |
| Reverse leakage current | IR |  |  | 3 | μA | VR = 1.0 V | 2 |
| Typical temperature coefficient |  | -3.5 |  | 0 | mV/℃ | IZTC = 5 mA | 2 |
| Maximum forward voltage | VF |  |  | 0.9 | V | IF = 10 mAdc | 1 |
| Power dissipation | PD |  |  | 250 | mW | Ta = 25℃ unless otherwise specified | 1 |
| Storage temperature range | Tstg | -55 |  | 150 | °C |  | 1 |
| Junction temperature | TJ | -55 |  | 150 | °C |  | 1 |
| Thermal resistance junction to ambient air | RθJA |  |  | 500 | °C/W |  | 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 |
|---|---|---|---|---|
| housing |  | black | 4. Body color: Black | 5 |
| contacts |  | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |

## CAD (KiCad official)

- Symbol: `BZX584C3V9Q`
- Footprint: `Diode_SMD:D_SOD-523`
- 3D model: SOD-523(SC-79) (KiCad packages3D, STEP)
- 3D model files: `bzx584c3v9q-etched.step` / `bzx584c3v9q-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx584c3v9q.step` / `bzx584c3v9q.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603373504570417152) (6 pp, sha256 `c4ab17363f7c9534`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/bzx584c3v9q-datasheet.pdf)