component

SMBJ18CA-Q

Public Made by Adom

by adom

Liown ESD And Surge Protection (TVS/ESD), SMB(DO-214AA). Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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SMBJ18CA-Q

Liown · ESD And Surge Protection (TVS/ESD) · SMB(DO-214AA)

SMBJ18CA-Q from Liown, in a SMB(DO-214AA). 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 Liown
Package SMB(DO-214AA)
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
Breakdown voltage (min) VB 20 V @IT = 1 mA 2
Breakdown voltage (max) VB 22.1 V @IT = 1 mA 2
Maximum clamping voltage VC 29.2 V @IPP = 20.6 A 2
Peak pulse power dissipation PPPM 600 W 10/1000μs waveform (Note1, Note2, Fig.1) 1
Steady state power dissipation PM(AV) 5 W TA=50℃ (Fig.5) 1
Peak forward surge current IFSM 60 A 8.3ms single half sine-wave, JEDEC method (Note3, Fig.6) 1
Operating junction and storage temperature range TJ, TSTG -55 150 ℃ 1
Typical thermal resistance, junction to lead RθJL 20 ℃/W 1
Typical thermal resistance, junction to ambient RθJA 100 ℃/W 1
Reverse stand-off voltage VR 18 V Bidirectional SMBJ18CA column 2
Reverse leakage current IR 1 μA @VR 2

CAD (KiCad official)

  • Symbol: SMBJ18CA-Q
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
  • 3D model files: smbj18ca-q-etched.step / smbj18ca-q-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); smbj18ca-q.step / smbj18ca-q.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Liown datasheet (6 pp, sha256 08620b4b14f97f1b, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary cathode-band convention (convention), consensus off (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