The X5R dielectric is a BaTiO3 base ceramic with proprietary additives. The dielectric is not expected to show visible color differences under typical use conditions, unless the Curie point has been exceeded. Typical test is charge/discharge cycle at 300% rated voltage for 5 seconds. On Thu, Aug 25, 2016 at 4:28 PM, Wayne Thayer - EXT <[log in to unmask]> wrote: > Hi Victor- > > You'd have to check the present spec from Murata. Historically, the overcoat on these parts was a ceramic and it would only change color if something really awful and immediately visually obvious occurred. I know that you can get certain grades of these parts that are somewhat flexible these days because of the historical problem of cracking the parts. Ceramic doesn't bend very well, so the engineering of these new parts is using a number of organic compounds. So, while I haven't worked with these new, more physically robust parts, I wouldn't be surprised if the overcoating were similar to those tantalum parts Joyce is mentioning. > > Wayne > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez > Sent: Thursday, August 25, 2016 12:00 PM > To: [log in to unmask] > Subject: [TN] MuRata, ceramic caps, 10micro F,, X5R, 25V, 1206 > > Fellow TechNetters: > > During the service life of a ceramic capacitor will the ceramic material color change in color due to normal usage? How about if the circuit draws too much current, overheating condition/leakage. > > Victor, -- Bhanu Sood Tel: (202) 468-8449