component
SMBJ78A-AT
Public Made by Adomby 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.
Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
| Name | Last updated |
|---|---|
| docs | 17d ago |
| viewers | 17d ago |
| package.json | 17d ago |
| page.json | 17d ago |
| README.md | 17d ago |
| smbj78a-at-etched.glb | 17d ago |
| smbj78a-at-etched.step | 17d ago |
| smbj78a-at-hero.glb | 17d ago |
| smbj78a-at-hero.overlay.json | 17d ago |
| smbj78a-at.glb | 17d ago |
| smbj78a-at.kicad_mod | 17d ago |
| smbj78a-at.kicad_sym | 17d ago |
| smbj78a-at.lbr | 17d ago |
| smbj78a-at.step | 17d ago |
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smbj78a-at.step/smbj78a-at.glbare 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, 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).