component
MMSZ3V9T1G
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
markdownMMSZ3V9T1G
onsemi · Zener Diodes · SOD-123
MMSZ3V9T1G 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 terminal of the Zener diode, identified by the polarity band on the package; the datasheet gives no pin-specific electrical limits, only the device maximum ratings (for example 500 mW total power dissipation on FR-5 board at TL = 75°C and junction/storage range of −55°C to +150°C). |
| 2 | ANODE | passive | Anode terminal of the Zener diode, opposite the polarity-band cathode; the datasheet gives no pin-specific electrical limits for this terminal. |
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 (nominal typ, min/max) at IZT1 | VZ1 | 3.71 | 3.9 | 4.1 | V | @ IZT1 = 5 mA, PW = 1 ms (Notes 3, 4) | 2 |
| Zener voltage at IZT2 | VZ2 | 2.9 | 3.5 | V | @ IZT2 = 1 mA (Notes 3, 4) | 2 | |
| Zener voltage tolerance (standard, printed ±5%) | -5 | 5 | % | Standard tolerance on nominal Zener voltage (Note 3) | 2 | ||
| Maximum Zener impedance at IZT1 | ZZT1 | 90 | Ω | @ IZT1 = 5 mA; IZ(AC) = 0.1 IZ(DC), f = 1 kHz (Notes 5) | 2 | ||
| Maximum Zener impedance at IZT2 | ZZT2 | 600 | Ω | @ IZT2 = 1 mA; IZ(AC) = 0.1 IZ(DC), f = 1 kHz (Notes 5) | 2 | ||
| Reverse leakage current | IR | 3 | µA | @ VR = 1 V | 2 | ||
| Forward voltage | VF | 0.95 | V | @ IF = 10 mA (table header) | 2 | ||
| Total power dissipation on FR-5 board | PD | 500 | mW | @ TL = 75°C, FR-5 board (Note 1); derated 6.7 mW/°C 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 (infrared scan method) | 1 | ||
| Thermal resistance, junction-to-lead | RJL | 150 | °C/W | Note 2 (infrared scan method) | 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:
MMSZ3V9T1G - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mmsz3v9t1g-etched.step/mmsz3v9t1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz3v9t1g.step/mmsz3v9t1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (7 pp, sha256
849f866ac91b3e2c, retrieved 2026-10-18, 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).