component
MMSZ5231B-E3-18
Public Made by Adomby adom
Vishay Intertech Zener Diodes, SOD-123. 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
markdownMMSZ5231B-E3-18
Vishay Intertech · Zener Diodes · SOD-123
MMSZ5231B-E3-18 from Vishay Intertech, in a SOD-123. 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 | Vishay Intertech |
| Package | SOD-123 |
| 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 tolerance (B suffix) | VZ | -5 | 5 | % | 'B' suffix (MMSZ5231B), per features text | 1 | |
| Reverse leakage current | IR | 5 | μA | at VR = 2 V | 2 | ||
| Zener impedance at IZT1 | ZZ | 17 | at IZT1 = 20 mA (note 2) | 2 | |||
| Zener impedance at IZT2 (knee) | ZZK | 1600 | at IZT2 = 0.25 mA (note 2) | 2 | |||
| Temperature coefficient of VZ | -0.03 | 0.03 | %/°C | 2 | |||
| Forward voltage | VF | 0.9 | V | IF = 10 mA | 2 | ||
| Power dissipation | Ptot | 500 | mW | TL = 75 °C, on FR-4 or FR-5 board with minimum recommended solder pad layout | 1 | ||
| Junction temperature | Tj | 150 | 1 | ||||
| Storage temperature range | Tstg | -65 | 150 | °C | 1 | ||
| Operating temperature range | Top | -55 | 150 | °C | 1 | ||
| Thermal resistance junction to ambient air | RthJA | 340 | K/W | on FR-4 or FR-5 board with minimum recommended solder pad layout | 1 | ||
| Zener voltage (nominal) | VZ | 5.1 | V | nominal; at IZT1 = 20 mA | 2 |
CAD (KiCad official)
- Symbol:
MMSZ5231B-E3-18 - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mmsz5231b-e3-18-etched.step/mmsz5231b-e3-18-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz5231b-e3-18.step/mmsz5231b-e3-18.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Vishay Intertech datasheet (5 pp, sha256
73e075c2224c5d82, retrieved 2026-10-19, 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).