What was the operating voltage of the board (5V?) and what was the voltage rating of the capacitor? Will this system allow voltages to go higher than the operating voltage such as a regulator that overshoots on initial turn-on or do you have spikes coming into the supply? The one thing that will cause caps to short is over voltage. Another is damage during handling or installation. Most caps should not be run in circuits that have voltages more than 50 to 80% of the rated voltage of the cap. Then there is just old infantile failures. Tom Dagostino Teraspeed Consulting Group LLC Teraspeed Consulting Group LLC 2926 SE Yamhill St. Device Modeling Division Portland, OR 97214 13610 SW Harness Lane Beaverton, OR 97008 http://www.teraspeed.com 503-430-1065 tom@xxxxxxxxxxxxx -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Pradeep Amrithraj Sent: Monday, January 20, 2003 6:43 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] De-coupling capacitor ** Proprietary ** Hi, in one of my boards (5V) a decoupling capacitor showed short .How does = this happen ? Can anyone give me an explanation . Regards Pradeep Amirtharaj Software Engineer L&T Emsys Mysore. Ph : 91 821 402561 Fax : 91 821 403752 Ext : 2728 Email : pradeepa@xxxxxxxxxxxxxxx ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu