On Fri, Dec 26, 2008 at 9:00 PM, gene <[email protected]> wrote: > What does it mean when manufactures specify 'Endurance @ temp' or 'life > time @ temp'? For example, one company claims: > Endurance : 105 C 1000 h to 5000h > Then they further state that after testing at 105C with maximum ripple > current applied, that when the part is cooled to 20C, it will then meet > original specs.
You may need to dig deeper into the specs or the app notes to verify the vendor terms match. Usually there is a "Service Life" quoted as number of hours at rated voltage at a specified core temperature. To increase the life of the capacitor you decrease the operating temperature and the operating voltage. For every 10degC decrease in temperature you get a factor of 2 in life (check the Arrhenius equation). I don't know the multiplier for voltage. (* jcl *) -- http://www.luciani.org _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
