component
MMSZ5251BS
Public Made by Adomby adom
hongjiacheng Zener Diodes, SOD-323. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
| Name | Last updated |
|---|---|
| docs | 4d ago |
| viewers | 4d ago |
| mmsz5251bs-etched.glb | 4d ago |
| mmsz5251bs-etched.step | 4d ago |
| mmsz5251bs-hero.glb | 4d ago |
| mmsz5251bs-hero.overlay.json | 4d ago |
| mmsz5251bs.glb | 4d ago |
| mmsz5251bs.kicad_mod | 4d ago |
| mmsz5251bs.kicad_sym | 4d ago |
| mmsz5251bs.lbr | 4d ago |
| mmsz5251bs.step | 4d ago |
| package.json | 4d ago |
| page.json | 4d ago |
| README.md | 4d ago |
MMSZ5251BS
hongjiacheng · Zener Diodes · SOD-323
MMSZ5251BS from hongjiacheng, 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 end marked by the cathode line on the SOD-323 body; goes positive of the anode in reverse zener operation (VZ 20.90 V min to 23.10 V max at IZT = 5.6 mA for the MMSZ5251BS). |
| 2 | A | passive | Anode, the end opposite the cathode line; forward voltage VF is 0.9 V at IF = 10 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| 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 | 20.9 | 22 | 23.1 | V | IZT=5.6 mA, Ta=25℃ | 2 |
| Test Current | IZT | 5.6 | mA | Ta=25℃ | 2 | ||
| Zener Impedance at IZT | ZZT | 29 | Ω | @IZT=5.6 mA | 2 | ||
| Zener Impedance at IZK | ZZK | 600 | Ω | @IZK=0.25 mA | 2 | ||
| Reverse Leakage Current | IR | 0.1 | μA | VR=17 V | 2 | ||
| Power Dissipation | PD | 200 | mW | Ta=25℃ | 1 | ||
| Forward Voltage | VF | 0.9 | V | IF=10mA | 1 | ||
| Storage Temperature | Tstg | -55 | 150 | ℃ | 1 | ||
| Junction Temperature | Tj | -55 | 150 | ℃ | 1 | ||
| Thermal Resistance Junction to Ambient | RθJ-A | 417 | ℃/W | Typical | 1 |
CAD (KiCad official)
- Symbol:
MMSZ5251BS - Footprint:
Diode_SMD:D_SOD-323 - 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files:
mmsz5251bs-etched.step/mmsz5251bs-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz5251bs.step/mmsz5251bs.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: hongjiacheng datasheet (4 pp, sha256
a3704ee5e1d22cbe, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-sonnet-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).