I am wondering if anybody has had similiar issues or can help resolve a failure we are experiencing. On about 4% of our units at first time power up 1 of two capacitors that are in parallel are burning up. Upon replacement the capacitor it to will work fine. The cap we are using is Vishay Sprague 594D336X9035R2. Since the other capacitor in parallel is unaffected, I am assuming that it is a Vishay issue. Per Vishay: The root cause of failure could not be identified. It is requested that the failure circumstances be reviewed. Failures can occur due to thermal stress during board mounting, strenuous application conditions, or because of reduced capacitor capability. There was no specific evidence of reduced capacitor capability identified. Please be aware, the thermal profile used for board mounting, and the application conditions (even transient conditions such as may occur with unregulated power supplies) can affect product performance. Has anyone else experienced a similiar failure or have an opinion? I wish I could pre-test the caps prior to them burning to supply an intact capacitor to Vishay for their analysis. Please note: When allowed to play its course the cap turned red hot, unsoldered itself from the PCB and burned a whole in the lab bench! --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------