component

SMBJ78A

Public Made by Adom

by adom

FOSAN 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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SMBJ78A

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

SMBJ78A from FOSAN, 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 FOSAN
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 (unidirectional, A suffix) VBR 86.7 99.7 V IT = 1 mA 2
Clamping voltage VC 126 V @IPP = 4.7 A 2
Reverse leakage current IR 5 µA @VRWM 2
Reverse stand-off working voltage VRWM 78 V 2
Peak Power Dissipation PPK 600 W 1
Power Dissipation PD 5 W 1
Peak Forward Surge Current (UNI) IFSM 100 A UNI 1
Forward Voltage (UNI) VF 3.5 V @IF=35A 1
Junction/Storage Temperature TJ,Tstg -55 150 ℃ 1

CAD (KiCad official)

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

Provenance

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

  • Datasheet: FOSAN datasheet (4 pp, sha256 3669787e11f43216, retrieved 2026-10-21, 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