Cap shorting Problem???? Failure Analysis Expert, In a low voltage high impedance circuit we are finding ~700ohm short across a .1uF capacitor in a low voltage, high impedance DC circuit. We find that over time the short develops, but a thermal cycle (touch-up) of the location causes the problem to disappear. We tried using X-ray of the cap's but proven inconclusive due to the density of the ceramic cap body and the suspected low mass of the short. Our initial impression is that dendritic growth is occurring, and over time the two pads short through this growth but we were not able to find any dendritic growth (?) using microscope (30X). Is dendritic growth possible through epoxy which porous in nature? This cap is glued on the bottom side using epoxy and goes through wave soldering operation. We are looking for any answer cum suggestion from anyone who has seen this kind of problem were able to resolve. Thanking you in advance. Re, Ken Patel ______________________________________________________ Ken Patel Phone: (408) 490-6804 575 Cottonwood Dr. Fax: (408) 490-6859 Milpitas, CA 95035 Beeper: (888) 769-1808 ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################