SMAJ18AQ
Public Made by Adomby adom
Yangzhou Yangjie Elec Tech ESD And Surge Protection (TVS/ESD), DO-214AC(SMA). 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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README
markdownSMAJ18AQ
Yangzhou Yangjie Elec Tech · ESD And Surge Protection (TVS/ESD) · DO-214AC(SMA)
SMAJ18AQ from Yangzhou Yangjie Elec Tech, in a DO-214AC(SMA). 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 | Yangzhou Yangjie Elec Tech |
| Package | DO-214AC(SMA) |
| 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, 10/1000us waveform | PPPM | 400 | W | 10/1000us waveform (notes 1, 2) | 1 | ||
| Power dissipation | PD | 1.25 | W | Ta=25℃ | 1 | ||
| Peak forward surge current | IFSM | 40 | A | 8.3 ms single half sine-wave, unidirectional only (note 2) | 1 | ||
| Operating junction temperature range | TJ | -55 | 175 | ℃ | 1 | ||
| Storage temperature range | TSTG | -55 | 175 | ℃ | 1 | ||
| Maximum instantaneous forward voltage | VF | 1.5 | V | @ 1A, unidirectional only | 1 | ||
| Breakdown voltage | VBR | 20 | 22.1 | V | @ IT = 1 mA (note 3: pulse test tp≤50ms) | 2 | |
| Maximum reverse leakage current | IR | 1 | μA | @ VRWM = 18.0 V | 2 | ||
| Working peak reverse voltage | VRWM | 18 | V | 2 | |||
| Maximum reverse surge current | IPP | 13.7 | A | surge current waveform per Fig.3, derated per Fig.2 (note 4) | 2 | ||
| Maximum clamping voltage | VC | 29.2 | V | @ IPP | 2 | ||
| Thermal resistance, junction to lead | RθJL | 30 | ℃/W | junction to lead | 3 | ||
| Thermal resistance, junction to ambient | RθJA | 120 | ℃/W | junction to ambient | 3 |
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 | 3 | |
| contacts | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |
CAD (KiCad official)
- Symbol:
SMAJ18AQ - Footprint:
Diode_SMD:D_SMA - 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files:
smaj18aq-etched.step/smaj18aq-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smaj18aq.step/smaj18aq.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Yangzhou Yangjie Elec Tech datasheet (6 pp, sha256
2e9b6a2b6ca2e2c6, 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).