Is there any Problem to put a ceramic capacitor (0.1nf/2kv) in a snubber circuit.

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  • \$\begingroup\$ Would you mind also add the circuit of it (I added one from Wikipedia to your question)? \$\endgroup\$ – Mohammad Etemaddar Nov 15 '13 at 6:08
  • \$\begingroup\$ @MohammadEtemaddar I approved the edit, but I'm having second thoughts. The circuit has numerous elements which may not be relevant to the question. \$\endgroup\$ – Kaz Nov 15 '13 at 6:26
  • \$\begingroup\$ @MohammadEtemaddar why have you added this circuit - the OP asks for 0.1nF (=100pF) capacitors not 10nF. \$\endgroup\$ – Andy aka Nov 15 '13 at 11:03

Basic snubber circuits are: -

  • Resistor in series with a capacitor
  • Diode in series with a parallel resistor and capacitor

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.


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