Hi,
With a 4 layer PCB, what is the standard max allowable voltages between stacked layers on one side of the FR-4? Is 600Volts pushing the dielectric breakdown of the insulation? Does this get checked during UL certification?
cheers, Jamie
4 layer PCB voltages
Apr 04, 2008
1 Replies
"FR-4" is pretty generic. Check with your particular board vendor. I just checked Isola 370HR, which is one FR-4 type material that I used on a recent project; it's rated over 700 volts per mil. There are things you can do to screw that up in processing: if the applied voltage is AC and there are any voids, you can get corona that will deteriorate organic dielectrics... so I'd ask the board house what they guarantee.
As for UL--seems like a good question for UL...likely not the last one before you're done!
Cheers, Tom
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