Hi Nicole,

I'm going to have to agree with the later respondents. The consistent
occurance of manufacturing defects in ceramic capacitors is extremely rare.
I believe Kemet makes 5 million ceramic capacitors a day. Almost 2 BILLION a
year. If the defect rate was even 0.1 %, that would be 1 million defective
capacitors.

Large capacitors, and you have large capacitors, a very sensitive to thermal
shock and excessive flex. Not to paint with a large brush, but my best guess
is that your failure analysis was insufficient and did not truly identify
root-cause. Check your thermal profile and make sure you do not exceed
4oC/minute in cooling or heating. Check your manufacturing for any flex
events (handling, bolting, depaneling, etc.) and make sure you do not exceed
60 inch bend radius.

I you need more assistance, give me a call or send me an email.

Best Regards
Craig
CALCE Electronic Products and Systems Center
University of Maryland
College Park, MD 20742
301-405-5316
[log in to unmask]

---------------------------------------------------------------------------------
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 the following message: SET Technet NOMAIL
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
---------------------------------------------------------------------------------