I am looking for a source for physically small 15pF ceramic disc
capacitors for use in the xtal section of a PIC.  The digikey
catalog doesn't have any that are really small, especially as
small as those found in Radio Shack's low capacitance blister pack (3/16"
diameter).
   Digikey did have some small 15pF monolithic ceramic caps that would be
perfect in size.  Can I use these instead?  Will these work at 4Mhz?

Thanks for the help or an leads.

Dave