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Re: 51pF Feedback Cap--NPO or Mica?

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PhilH

(A)

In Reply to: 51pF Feedback Cap--NPO or Mica? posted by David Anderson on January 31, 2004 at 00:16:42:

David
I recommend dipped silver mica. Ceramics exhibit a piezoelectric behavior when hit with a hard transient. Mica's are stable with respect to time, temperature, and electrical stress, and they are fairly low-leakage.
I'm also not sure that you will be able to find the better ceramic dielectrics at the voltages you need, but check on this.
Phil

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Re: 51pF Feedback Cap--NPO or Mica? - David Anderson 08:03:16 01/31/04 (0)
What I read on a couple of websites was that the X7R and Z5U ceramics exhibit this piezoelectric behavior due to materials added to the ceramic to increase the capacitance per volume, but that the COG/NPO types do not.
I can source these in 500V values.
David

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