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MM3Z22B
Public Made by Adomby adom
ST Semtech Zener Diodes, SOD-323. 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
markdownMM3Z22B
ST Semtech · Zener Diodes · SOD-323
MM3Z22B from ST Semtech, in a SOD-323. 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, marked by the cathode line on the package; MM3ZB22 has VZT 21.56 to 22.44 V at IZT = 5 mA. |
| 2 | Anode | passive | Anode of the zener diode; the package power dissipation is 300 mW and the junction temperature range is -55 to +150 °C. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ST Semtech |
| Package | SOD-323 |
| 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 | VZT | 21.56 | 22 | 22.44 | V | at IZT = 5 mA, pulses 20 ms | 2 |
| Zener Voltage Tolerance | -2 | 2 | % | 1 | |||
| Dynamic Impedance | ZZT | 55 | Ω | at IZT = 5 mA | 2 | ||
| Reverse Leakage Current | IR | 0.1 | μA | at VR = 17 V | 2 | ||
| Forward Voltage | VF | 0.9 | V | IF = 10 mA | 2 | ||
| Total Power Dissipation | Ptot | 300 | mW | Ta = 25℃ | 1 | ||
| Operating Junction Temperature Range | Tj | -55 | 150 | ℃ | Ta = 25℃ | 1 | |
| Storage Temperature Range | Tstg | -55 | 150 | ℃ | Ta = 25℃ | 1 | |
| Thermal Resistance Junction to Ambient | RθJA | 417 | ℃/W | Device mounted on FR-4 substrate PC board, 2oz copper, minimum recommended pad layout | 1 |
CAD (KiCad official)
- Symbol:
MM3Z22B - Footprint:
Diode_SMD:D_SOD-323 - 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files:
mm3z22b-etched.step/mm3z22b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mm3z22b.step/mm3z22b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ST Semtech datasheet (4 pp, sha256
516fde18dd79a5a8, retrieved 2026-10-22, tier: lcsc) - 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).