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MMSZ18T1G

Public Made by Adom

by adom

onsemi Zener Diodes, SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MMSZ18T1G

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsz18t1g.step / mmsz18t1g.glb are 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, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF