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Working from a data sheet reference design a 47nF/X 250V capacitor is recommended.

What makes a capacitor an X capacitor? From some googling i've found that X capacitors are meant to go across mains. From some vague references they are metalized film capacitors because they are self healing.

Would any metalized film capacitor be an X capacitor as long as the voltage rating is met or exceeded, or is there some other specific rating that officially makes it an X capacitor?

Would a data sheet specifically say "X" capacitor or is there some other subtle way that it would be listed?

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The datasheet has to say "X capacitor" in pretty large letters on the first page. You shouldn't be inferring the X-rating from electrical specs. (Same for Y-rating, while we're at it.)

Some additional background on X- and Y-capacitors can be found here (presentation slides as PDF) and here.

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