# BZT52B4V3SQ

**Yangzhou Yangjie Elec Tech** · Zener Diodes · SOD-323(SC-90)

BZT52B4V3SQ from Yangzhou Yangjie Elec Tech, in a SOD-323(SC-90). 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-323(SC-90) |
| 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) at Izt | Vz | 4.21 | 4.3 | 4.39 | V | Izt 5 mA | 2 |
| Zener impedance Zzt | Zzt |  |  | 90 | Ω | IZt 5 mA | 2 |
| Zener impedance Zzk | Zzk |  |  | 600 | Ω | Izk 1.0 mA | 2 |
| Reverse leakage current IR | IR |  |  | 3 | uA | VR 1.0 V | 2 |
| Typical temperature coefficient |  | -3.5 |  | 0 | mV/℃ | @ IZTC 5 mA | 2 |
| VZ tolerance |  | -2 |  | 2 | % | approximately, per Features | 1 |
| Maximum forward voltage | VF |  |  | 0.9 | V | IF=10mAdc | 1 |
| Power dissipation | PD |  |  | 300 | mW | Ta=25℃, footnote (1) FR4 PCB | 1 |
| Power derating |  |  |  | 2.4 | mW/℃ | Derate above 25℃ | 1 |
| Storage temperature range | Tstg | -55 |  | 150 | °C |  | 1 |
| Junction temperature | TJ | -55 |  | 150 | °C |  | 1 |
| Thermal resistance junction to ambient air | RthJA(1) |  | 415 |  | °C/W | Device mounted on FR4 PCB (1.0 x 1.0 x 0.06 inch), single-sided copper, tin-plated, standard footprint | 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 ● Polarity: Cathode line denotes the cathode end | 1 |

## CAD (KiCad official)

- Symbol: `BZT52B4V3SQ`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323(SC-90) (KiCad packages3D, STEP)
- 3D model files: `bzt52b4v3sq-etched.step` / `bzt52b4v3sq-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzt52b4v3sq.step` / `bzt52b4v3sq.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/8603373226974601216) (6 pp, sha256 `55046f0a90a36421`, retrieved 2026-10-17, 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/bzt52b4v3sq-datasheet.pdf)