component
BZX55C18
Public Made by Adomby adom
LGE Zener Diodes, DO-35. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, 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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Contents
README
markdownBZX55C18
LGE · Zener Diodes · DO-35
BZX55C18 from LGE, in a DO-35. 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 | LGE |
| Package | DO-35 |
| 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 (BZX55C18 nominal 18 V) | VZ | 16.8 | 19.1 | V | at IZT = 5.0 mA; pulse, TJ more than 2 °C above TA (note 3) | 2 | |
| Zener impedance (dynamic) at IZT | ZZT | 50 | Ohms | at IZT = 5.0 mA | 2 | ||
| Zener impedance at IZK | ZZK | 170 | Ohms | at IZK = 1.0 mA | 2 | ||
| Reverse leakage current | IR | 0.1 | uA | at VR = 14 V | 2 | ||
| Power dissipation | Pd | 500 | mW | 1 | |||
| Maximum forward voltage | VF | 1 | V | IF = 100mA | 1 | ||
| Storage temperature range | TSTG | -65 | 200 | °C | 1 | ||
| Operating junction temperature | TJ | 200 | °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 | Solder hot dip Tin(Sn) lead finish Cathode indicated by polarity band | 1 |
CAD (KiCad official)
- Symbol:
BZX55C18 - Footprint:
Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal - 3D model: DO-35 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LGE datasheet (2 pp, sha256
7b64aa8e03dd617e, retrieved 2026-10-21, 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).