component
MMSZ18T1G
Public Made by Adomby adom
onsemi Zener Diodes, SOD-123. Pinout cross-checked by two models against the datasheet, 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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Contents
README
markdownMMSZ18T1G
onsemi · Zener Diodes · SOD-123
MMSZ18T1G from onsemi, 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 | Cathode | passive | Cathode is pin 1 under SOD-123 Style 1 and is the end marked by the polarity band on the case. The datasheet gives no pin-specific electrical limits; the 500 mW rating applies to the device. |
| 2 | Anode | passive | Anode is pin 2 under SOD-123 Style 1 and is the end opposite the polarity band. The datasheet gives no pin-specific electrical limits; the 500 mW rating applies to the device. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage @ IZT1 | VZ1 | 17.1 | 18 | 18.9 | V | @ IZT1 = 5 mA (Notes 3 and 4) | 2 |
| Reverse Zener Voltage @ IZT2 | VZ2 | 16.7 | 19 | V | @ IZT2 = 1 mA (Notes 3 and 4) | 2 | |
| Maximum Zener Impedance @ IZT1 | ZZT1 | 45 | Ω | @ IZT1 = 5 mA (Note 5) | 2 | ||
| Maximum Zener Impedance @ IZT2 | ZZT2 | 225 | Ω | @ IZT2 = 1 mA (Note 5) | 2 | ||
| Zener voltage tolerance on nominal VZ (standard) | -5 | 5 | % | Standard tolerance on nominal Zener voltage (Note 3) | 2 | ||
| Maximum Reverse Leakage Current | IR | 0.05 | µA | @ VR = 12.6 V | 2 | ||
| Forward Voltage | VF | 0.9 | V | @ IF = 10 mA | 2 | ||
| Total Power Dissipation on FR-5 Board | PD | 500 | mW | On FR-5 Board, (Note 1) @ TL = 75°C | 1 | ||
| Junction and Storage Temperature Range | TJ, Tstg | -55 | 150 | °C | 1 | ||
| Thermal Resistance, Junction-to-Ambient | RJA | 340 | °C/W | Junction-to-Ambient (Note 2) | 1 | ||
| Thermal Resistance, Junction-to-Lead | RJL | 150 | °C/W | Junction-to-Lead (Note 2) | 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 | PPA | ESD Rating of Class 3 (> 16 kV) per Human Body Model AEC−Q101 Qualified and PPAP Capable | 1 |
CAD (KiCad official)
- Symbol:
MMSZ18T1G - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mmsz18t1g-etched.step/mmsz18t1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz18t1g.step/mmsz18t1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (6 pp, sha256
603226f6af79b420, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).