In a message dated 2/25/06 11:39:44 AM Eastern Standard Time, [log in to unmask] writes: I have seen the "perfect mouse bite" condition a number of times. The bite is perfectly round and on one side of the trace. The most common cause is "hydrogen overvoltage". Thank you for such a concise description of this haunting problem. Calculations relating to current density remain so important, especially with the ever shrinking trace width and growing panel size. This group never ceases to amaze with the knowledge it contains and shares. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------