Is there any Problem to put a ceramic capacitor (0.1nf/2kv) in a snubber circuit.
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Basic snubber circuits are: -
The "well-known" and documented potential problem with ceramic capacitors is their high Q (very low effective series resistance, ESR). This can cause unnecessary "ringing" and voltage peaks that can exceed voltage ratings for some semiconductor devices.
It can cause problems on power supplies of certain types but, as a snubber, the ESR is limited by the series resistor or the series diode.