component
SZMMSZ5231BT1G
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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README
markdownSZMMSZ5231BT1G
onsemi · Zener Diodes · SOD-123
SZMMSZ5231BT1G 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 5.1 V Zener diode (VZ 4.85-5.36 V @ IZT = 20 mA), marked by the polarity band; connect to the more positive side for reverse Zener regulation. |
| 2 | Anode | passive | Anode of the Zener diode (SOD-123 Style 1), with forward voltage VF of 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 | VZ | 4.85 | 5.1 | 5.36 | V | @ IZT = 20 mA, TA = 25°C | 3 |
| Zener Test Current | IZT | 20 | mA | 3 | |||
| Maximum Zener Impedance | ZZT | 17 | Ω | @ IZT = 20 mA; IZ(AC)=0.1 IZ(dc), f = 1 kHz | 3 | ||
| Maximum Zener Impedance | ZZK | 1600 | Ω | @ IZK = 0.25 mA; IZ(AC)=0.1 IZ(dc), f = 1 kHz | 3 | ||
| Reverse Leakage Current | IR | 5 | µA | @ VR = 2 V | 3 | ||
| Forward Voltage | VF | 0.9 | V | IF = 10 mA | 3 | ||
| Total Power Dissipation on FR-5 Board | PD | 500 | mW | TL = 75°C | 1 | ||
| Power Derating above 75°C | PD derate | 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 | RθJA | 340 | °C/W | Note 2 | 1 | ||
| Thermal Resistance, Junction-to-Lead | RθJL | 150 | °C/W | Note 2 | 1 | ||
| Zener Voltage Tolerance | -5 | 5 | % | B suffix, on nominal Zener voltage | 3 | ||
| Maximum Case Temperature for Soldering | 260 | °C | 10 seconds | 1 |
CAD (KiCad official)
- Symbol:
SZMMSZ5231BT1G - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
szmmsz5231bt1g-etched.step/szmmsz5231bt1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);szmmsz5231bt1g.step/szmmsz5231bt1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (7 pp, sha256
dd020fc5576bb75b, retrieved 2026-10-22, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).