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MM3Z18
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ST Semtech Zener Diodes, SOD-323. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
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MM3Z18
ST Semtech · Zener Diodes · SOD-323
MM3Z18 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 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
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 | VZ | 16.8 | 18 | 19.1 | V | @ IZT = 5.0 mA, pulses 20 ms | 2 |
| Zener Impedance | ZZ | 45 | Ω | @ IZ = 5.0 mA | 2 | ||
| Leakage Current | IR | 0.1 | μA | @ VR = 13 V | 2 | ||
| Temperature coefficient of Zener Voltage | TKvz | 0.03 | 0.11 | %/K | 2 | ||
| Power Dissipation | Ptot | 300 | mW | Ta = 25 °C | 1 | ||
| Forward Voltage | VF | 0.9 | V | IF = 10 mA, Ta = 25 °C | 1 | ||
| Thermal Resistance Junction to Ambient | RӨJA | 0.3 | K/mW | Ta = 25 °C | 1 | ||
| Junction Temperature | TJ | 150 | °C | Ta = 25 °C | 1 | ||
| Storage Temperature Range | TSTG | -65 | 150 | °C | Ta = 25 °C | 1 | |
| Test Current | IZT | 5 | mA | Zener voltage test current | 2 |
CAD (KiCad official)
- Symbol:
MM3Z18 - Footprint:
Diode_SMD:D_SOD-323 - 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files:
mm3z18-etched.step/mm3z18-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mm3z18.step/mm3z18.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ST Semtech datasheet (2 pp, sha256
9a5117ef1800bc66, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band convention(convention), consensusoff(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).
# MM3Z18
**ST Semtech** · Zener Diodes · SOD-323
MM3Z18 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 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
## 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 | VZ | 16.8 | 18 | 19.1 | V | @ IZT = 5.0 mA, pulses 20 ms | 2 |
| Zener Impedance | ZZ | | | 45 | Ω | @ IZ = 5.0 mA | 2 |
| Leakage Current | IR | | | 0.1 | μA | @ VR = 13 V | 2 |
| Temperature coefficient of Zener Voltage | TKvz | 0.03 | | 0.11 | %/K | | 2 |
| Power Dissipation | Ptot | | | 300 | mW | Ta = 25 °C | 1 |
| Forward Voltage | VF | | | 0.9 | V | IF = 10 mA, Ta = 25 °C | 1 |
| Thermal Resistance Junction to Ambient | RӨJA | | | 0.3 | K/mW | Ta = 25 °C | 1 |
| Junction Temperature | TJ | | | 150 | °C | Ta = 25 °C | 1 |
| Storage Temperature Range | TSTG | -65 | | 150 | °C | Ta = 25 °C | 1 |
| Test Current | IZT | | 5 | | mA | Zener voltage test current | 2 |
## CAD (KiCad official)
- Symbol: `MM3Z18`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `mm3z18-etched.step` / `mm3z18-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mm3z18.step` / `mm3z18.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [ST Semtech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588880529425387520) (2 pp, sha256 `9a5117ef1800bc66`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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](docs/mm3z18-datasheet.pdf)