component
MMSZ4678
Public Made by Adomby adom
amsem Zener Diodes, SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MMSZ4678
amsem · Zener Diodes · SOD-123
MMSZ4678 from amsem, 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 | K | passive | Cathode, marked by the cathode band on the package; goes positive relative to the anode in Zener regulation, with VZ 1.71 V to 1.89 V (1.8 V nominal) at IZT = 50 µA for MMSZ4678. |
| 2 | A | passive | Anode, the end opposite the cathode band; the part is rated 500 mW power dissipation at Ta = 25 °C. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | amsem |
| 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@IZT | 1.71 | 1.8 | 1.89 | V | IZT = 50 uA | 1 |
| Leakage Current | IR | 7.5 | uA | VR = 1 V | 1 | ||
| Power Dissipation | PD | 500 | mW | 1 | |||
| Junction Temperature | TJ | 150 | °C | 1 | |||
| Storage Temperature | TSTG | -55 | 125 | °C | 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 |
|---|---|---|---|---|
| contacts | tin | ◇ Matte Tin (Sn) Lead finish ◇ Cathode Band / Device marking | 1 |
CAD (KiCad official)
- Symbol:
MMSZ4678 - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mmsz4678-etched.step/mmsz4678-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz4678.step/mmsz4678.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: amsem datasheet (4 pp, sha256
25f1dace991b5532, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).
# MMSZ4678
**amsem** · Zener Diodes · SOD-123
MMSZ4678 from amsem, 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 | K | passive | Cathode, marked by the cathode band on the package; goes positive relative to the anode in Zener regulation, with VZ 1.71 V to 1.89 V (1.8 V nominal) at IZT = 50 µA for MMSZ4678. |
| 2 | A | passive | Anode, the end opposite the cathode band; the part is rated 500 mW power dissipation at Ta = 25 °C. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | amsem |
| 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@IZT | 1.71 | 1.8 | 1.89 | V | IZT = 50 uA | 1 |
| Leakage Current | IR | | | 7.5 | uA | VR = 1 V | 1 |
| Power Dissipation | PD | | | 500 | mW | | 1 |
| Junction Temperature | TJ | | | 150 | °C | | 1 |
| Storage Temperature | TSTG | -55 | | 125 | °C | | 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 |
|---|---|---|---|---|
| contacts | | tin | ◇ Matte Tin (Sn) Lead finish ◇ Cathode Band / Device marking | 1 |
## CAD (KiCad official)
- Symbol: `MMSZ4678`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mmsz4678-etched.step` / `mmsz4678-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmsz4678.step` / `mmsz4678.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [amsem datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602912511163179008) (4 pp, sha256 `25f1dace991b5532`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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](docs/mmsz4678-datasheet.pdf)