SD18
Public Made by Adomby adom
MDD Microdiode Semiconductor ESD And Surge Protection (TVS/ESD), 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.
| Name | Last updated |
|---|---|
| docs | 9d ago |
| viewers | 9d ago |
| package.json | 9d ago |
| page.json | 9d ago |
| README.md | 9d ago |
| sd18-etched.glb | 9d ago |
| sd18-etched.step | 9d ago |
| sd18-hero.glb | 9d ago |
| sd18-hero.overlay.json | 9d ago |
| sd18.glb | 9d ago |
| sd18.kicad_mod | 9d ago |
| sd18.kicad_sym | 9d ago |
| sd18.lbr | 9d ago |
| sd18.step | 9d ago |
SD18
MDD Microdiode Semiconductor · ESD And Surge Protection (TVS/ESD) · SOD-323
SD18 from MDD Microdiode Semiconductor, 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 | MDD Microdiode Semiconductor |
| Package | SOD-323 |
| Category | Circuit Protection |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse working voltage | VRWM | 18 | V | 2 | |||
| Breakdown voltage | VB | 20 | V | IT = 1 mA | 2 | ||
| Clamping voltage | VC | 29 | V | @1A | 2 | ||
| Clamping voltage | VC | 45 | V | @9A | 2 | ||
| Reverse leakage current | IR | 1 | µA | 2 | |||
| Capacitance | CT | 100 | pF | 2 | |||
| ESD per IEC 61000-4-2 (Air) | VESD | -30 | 30 | kV | TA=25°C | 1 | |
| ESD per IEC 61000-4-2 (Contact) | VESD | -30 | 30 | kV | TA=25°C | 1 | |
| Peak Pulse Power | PPP | 350 | W | tp=8/20us waveform | 1 | ||
| Operating Temperature | TOPT | -55 | 150 | °C | 1 | ||
| Storage Temperature | TSTG | -55 | 150 | °C | 1 | ||
| Lead Solder Temperature | TL | 260 | °C | 10 sec duration, maximum | 1 | ||
| Test current | IT | 1 | mA | 2 |
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 | Terminal: Matte tin plated. http://www.microdiode.com Page :2 | 1 |
CAD (KiCad official)
- Symbol:
SD18 - Footprint:
Diode_SMD:D_SOD-323 - 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files:
sd18-etched.step/sd18-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sd18.step/sd18.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MDD Microdiode Semiconductor datasheet (4 pp, sha256
10c3d65b4326cef2, 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).