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MMSZ20T1G

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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MMSZ20T1G

onsemi · Zener Diodes · SOD-123

MMSZ20T1G 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 of the Zener diode, indicated by the polarity band; for MMSZ20T1G, VZ is 20 V nominal (19.00 V min to 21.00 V max) at IZT1 = 2 mA, and this terminal is positive in Zener regulation.
2 Anode passive Anode of the Zener diode (STYLE 1, pin 2); forward voltage is 0.9 V max at IF = 10 mA.

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
Zener Voltage 1 VZ1 19 20 21 V IZT1 = 5 mA, PW = 1 ms 2
Zener Voltage 2 VZ2 18.7 21.1 V IZT2 = 1 mA, PW = 1 ms 2
Maximum Zener Impedance 1 ZZT1 55 Ω IZT1 = 5 mA, IZ(AC) = 0.1 IZ(DC), f = 1 kHz 2
Maximum Zener Impedance 2 ZZT2 225 Ω IZT2 = 1 mA, IZ(AC) = 0.1 IZ(DC), f = 1 kHz 2
Max Reverse Leakage Current IR 0.05 µA VR = 14 V 2
Forward Voltage VF 0.9 V IF = 10 mA 2
Zener Voltage Tolerance -5 5 % standard tolerance on nominal Zener voltage 2
Total Power Dissipation on FR-5 Board PD 500 mW TL = 75°C 1
Power Derating above 75°C PD 6.7 mW/°C Derated above 75°C 1
Junction and Storage Temperature Range TJ, Tstg -55 150 °C 1
Thermal Resistance, Junction-to-Ambient RJA 340 °C/W Note 2 1
Thermal Resistance, Junction-to-Lead RJL 150 °C/W 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: MMSZ20T1G
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123 (KiCad packages3D, STEP)
  • 3D model files: mmsz20t1g-etched.step / mmsz20t1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsz20t1g.step / mmsz20t1g.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: onsemi datasheet (6 pp, sha256 4a61e8bedacf2866, retrieved 2026-10-22, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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