Hello!

does any one have any specifications or guidlines regarding conductor spacing in dependance of the PCB-material used? I couldn't find any information about this in the IPC-2220 series.
We observed a difference between FR-2 boards and CEM-1. On a FR-2 board flashovers seem to happen more likely than on CEM-1 boards at the same conductor spacing and voltage. We are not sure if it is a matter of process material (e.g. flux) which reacts differently with the these two PCB materials or if it is a general design issue which needs to be considered for each material individually. Are there any design guidlines for the proper spacing of conductors at a certain voltage difference in dependance of the PCB material?
I would be grateful for any answers and inputs! Thank you!
Best regards

Philipp Hechenberger
Quality Engineer

TridonicAtco GmbH & Co KG
Färbergasse 15
6851 Dornbirn
Austria
www.tridonicatco.com

Tel. +43 5572 395-4460
Fax +43 5572 395-94460
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