2SC3326 - transistor with high Vebo (25V) - used by fluke as an avalanche diode.
Minimum looks like about 55V, minium available upper limit for spark starting more like 85V.
What is needed / useful to protect NMEA 2000 network from nearby lightning strikes, or even direct ones?
http://ww1.microchip.com/downloads/en/DeviceDoc/EMC%20Newsletter%20Issue%205.pdf https://www.eevblog.com/forum/beginners/what-is-a-spark-gap-and-why-we-need-it-on-a-pcb/