component
MMSZ5250BS
Public Made by Adomby adom
Changjing Zener Diodes, SOD-323. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownMMSZ5250BS
Changjing · Zener Diodes · SOD-323
MMSZ5250BS from Changjing, 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 | Changjing |
| 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 | 19 | 20 | 21 | V | @ IZT = 6.2 mA | 2 |
| Maximum Zener Impedance | ZZT | 25 | Ω | @ IZT = 6.2 mA | 2 | ||
| Maximum Zener Impedance (knee) | ZZK | 600 | Ω | @ IZK = 0.25 mA | 2 | ||
| Maximum Reverse Current | IR | 0.1 | uA | @ VR = 15 V | 2 | ||
| Forward Voltage | VF | 0.9 | V | IF = 10mA, pulses Tp≤1.0ms | 1 | ||
| Power Dissipation | PD | 200 | mW | Ta=25℃, device mounted on ceramic PCB | 1 | ||
| Thermal Resistance, Junction to Ambient Air | RθJA | 625 | ℃/W | Device mounted on ceramic PCB | 1 | ||
| Operating and Storage Temperature Range | Tj,TSTG | -65 | 150 | ℃ | 1 | ||
| Zener Test Current | IZT | 6.2 | mA | 2 | |||
| Zener Knee Test Current | IZK | 0.25 | mA | 2 | |||
| Reverse Voltage for IR | VR | 15 | V | 2 |
CAD (KiCad official)
- Symbol:
MMSZ5250BS - Footprint:
Diode_SMD:D_SOD-323 - 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files:
mmsz5250bs-etched.step/mmsz5250bs-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz5250bs.step/mmsz5250bs.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (3 pp, sha256
55a991103f766e72, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band convention(convention), consensusoff(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).