# BZX84C4V3A

**Shandong Jingdao Microelectronics** · Zener Diodes · SOT-23

BZX84C4V3A from Shandong Jingdao Microelectronics, in a SOT-23. 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 | A | passive | Zener diode anode (Suffix A single-diode version); the Suffix A drawing shows the diode connected between pin 1 and pin 3. |
| 2 | NC | unconnected | No internal connection in the Suffix A single-diode version; the package drawing shows no diode attached to pin 2. |
| 3 | K | passive | Zener diode cathode (Suffix A single-diode version); the BZX84C4V3A has a 4.3V nominal zener voltage with 350mW maximum power dissipation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shandong Jingdao Microelectronics |
| 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 (VZT) | VZT | 4 | 4.3 | 4.6 | V | IZT = 5 mA; VZT tested with 20 ms pulses | 3 |
| Voltage tolerance (C suffix series) |  | -5 |  | 5 | % | Footnote (3) C: ±5%; BZX84C series | 3 |
| Dynamic impedance | ZZT |  |  | 130 | Ω | at IZT = 5 mA | 3 |
| Reverse current | IR |  |  | 5 | μA | VR = 1 V | 3 |
| Power dissipation | Ptot |  |  | 350 | mW | Ta = 25 °C | 1 |
| Operating and storage temperature range | Tj, Tstg | -55 |  | 150 | °C |  | 1 |
| Forward voltage | VF |  | 0.9 |  | V | IF = 10 mA | 1 |

## CAD (KiCad official)

- Symbol: `BZX84C4V3A`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bzx84c4v3a-etched.step` / `bzx84c4v3a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx84c4v3a.step` / `bzx84c4v3a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shandong Jingdao Microelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590892578835546112) (4 pp, sha256 `abb7c0e41de9a21a`, 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/bzx84c4v3a-datasheet.pdf)