component

SMBJ78A-AT

Public Made by Adom

by adom

Brightking 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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SMBJ78A-AT

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

SMBJ78A-AT from Brightking, 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 Brightking
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
Peak pulse power dissipation PPPM 600 Watts 10/1000μs waveform (Note1, Note2, Fig.1) 1
Steady state power dissipation PM(AV) 5 Watts TA=50℃ (Fig.5) 1
Peak forward surge current IFSM 100 Amps 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 (unidirectional) VRWM 78 V 3
Breakdown voltage VBR 86.7 95.8 V @IT 1 mA 3
Maximum clamping voltage VC 126 V @IPP 4.8 A 3
Reverse leakage current IR 1 μA @VRWM 3
Preheat temperature minimum TS min 150 ℃ Reflow, Pb-free assembly 6
Preheat temperature maximum TS max 200 ℃ Reflow, Pb-free assembly 6
Preheat time tS 60 180 seconds Reflow, Pb-free assembly, min to max 6
Average ramp-up rate (TL to TP) 3 ℃/second Reflow, Pb-free assembly 6
Time maintained above liquidus temperature TL 217 ℃ Reflow, Pb-free assembly 6
Time maintained above TL tL 60 150 seconds Reflow, Pb-free assembly 6
Peak temperature TP 260 ℃ Reflow, Pb-free assembly 6
Time within 5℃ of actual peak temperature tP 20 40 seconds Reflow, Pb-free assembly 6
Ramp-down rate 6 ℃/second Reflow, Pb-free assembly 6
Time 25℃ to peak temperature 8 minutes Reflow, Pb-free assembly 6

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 copper 2. Mounted on 5.0mm×5.0mm (0.03mm thick) copper pads to each terminal. 1

CAD (KiCad official)

  • Symbol: SMBJ78A-AT
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
  • 3D model files: smbj78a-at-etched.step / smbj78a-at-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); smbj78a-at.step / smbj78a-at.glb are the bare package body.

Provenance

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

  • Datasheet: Brightking datasheet (7 pp, sha256 a2bc93a3b45c5e72, retrieved 2026-10-16, 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