# UDZSTE-173.3B

**YONGYUTAI** · Zener Diodes · SOD-323

UDZSTE-173.3B from YONGYUTAI, 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 | 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 | YONGYUTAI |
| Package | SOD-323 |
| 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 | 3.1 | 3.3 | 3.5 | V | @Izt=5mA | 1 |
| Maximum Zener Impedance | Zzt |  |  | 95 | Ω | @Izt=5mA | 1 |
| Maximum Zener Knee Impedance | Zzk |  |  | 600 | Ω | @Izk=1.0mA | 1 |
| Maximum Reverse Current | IR |  |  | 5 | uA | VR=1.0V | 1 |
| Typical Temperature Coefficient | IZTC | -3.5 |  | 0 | mV/℃ | Test current 5mA | 1 |
| Power Dissipation | Pd |  |  | 200 | mW |  | 1 |
| Forward Voltage | Vf |  |  | 0.9 | V | IF=10mA | 1 |
| Storage temperature range | Ts | -65 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `UDZSTE-173.3B`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `udzste-173-3b-etched.step` / `udzste-173-3b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `udzste-173-3b.step` / `udzste-173-3b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YONGYUTAI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590191831130025984) (5 pp, sha256 `c72a208771c1ed0c`, retrieved 2026-10-22, 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/udzste-173-3b-datasheet.pdf)