component
SMDJ18AQ
Public Made by Adomby adom
Yangzhou Yangjie Elec Tech ESD And Surge Protection (TVS/ESD), DO-214AB(SMC). 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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Contents
README
markdownSMDJ18AQ
Yangzhou Yangjie Elec Tech · ESD And Surge Protection (TVS/ESD) · DO-214AB(SMC)
SMDJ18AQ from Yangzhou Yangjie Elec Tech, in a DO-214AB(SMC). 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 band on the uni-directional SMDJ18AQ (VRWM 18 V, VBR 20.00-22.10 V at 1 mA, max clamping voltage 29.2 V at 102.74 A). |
| 2 | A | passive | Anode terminal of the uni-directional SMDJ18AQ, opposite the polarity band; peak pulse power 3000 W with a 10/1000 µs waveform. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | DO-214AB(SMC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak power dissipation | PPPM | 3000 | W | 10/1000us waveform, Ta=25℃ | 1 | ||
| Power dissipation on infinite heat sink | PD | 6.5 | W | TL=75℃ | 1 | ||
| Peak forward surge current | IFSM | 300 | A | 8.3 ms single half sine-wave, unidirectional only | 1 | ||
| Operating junction temperature | TJ | -55 | 175 | ℃ | 1 | ||
| Storage temperature range | TSTG | -55 | 175 | ℃ | 1 | ||
| Maximum instantaneous forward voltage | VF | 3.5 | V | at 100A, unidirectional only | 1 | ||
| Breakdown voltage | VBR | 20 | 22.1 | V | @ IT = 1 mA | 2 | |
| Test current | IT | 1 | mA | Pulse test tp≤50ms | 2 | ||
| Maximum reverse leakage | IR | 1 | μA | @ VRWM | 2 | ||
| Working peak reverse voltage | VRWM | 18 | V | 2 | |||
| Maximum reverse surge current | IPP | 102.74 | A | Waveform per Fig.3, derated per Fig.2 | 2 | ||
| Maximum clamping voltage | Vc | 29.2 | V | @ IPP | 2 | ||
| Thermal resistance junction to ambient | RθJA | 75 | ℃/W | junction to ambient | 2 | ||
| Thermal resistance junction to lead | RθJL | 15 | ℃/W | junction to lead | 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 |
|---|---|---|---|---|
| housing | black | 4. Body color: Black | 4 | |
| contacts | tin | ● Terminals: Matte tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |
CAD (KiCad official)
- Symbol:
SMDJ18AQ - Footprint:
Diode_SMD:D_SMC - 3D model: DO-214AB(SMC) (KiCad packages3D, STEP)
- 3D model files:
smdj18aq-etched.step/smdj18aq-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smdj18aq.step/smdj18aq.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Yangzhou Yangjie Elec Tech datasheet (5 pp, sha256
f699c92f072cb9bb, 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).