Recently I've seen notes in datasheets from capacitor manufacturers Kemet and AVX that recommend designers not use X7R capacitors for applications in which they will be placed across mains or used for mains filtering. From AVX:
Capacitors with X7R dielectrics are not intended for applications across AC supply mains or AC line filtering with polarity reversal.
Q1) Why is this recommendation made? The datasheets don't go into detail, and I have not seen an app notes or white papers that adequately explain the issue.
Q2) Under what AC conditions is it ok to use X7R capacitors across AC signals? Is their suitability based on simply having a current-limited/high-impedance source?
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