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July 2005

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Subject:
From:
John Burke <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, John Burke <[log in to unmask]>
Date:
Thu, 14 Jul 2005 13:25:39 -0700
Content-Type:
text/plain
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text/plain (159 lines)
Here is a calculator link that tells you how far you can bend the board
before the component cracks!!

http://www.calce.umd.edu/general/calculator/

And here is a link to a web paper which covers most of the issues:

http://www.syfer.com/ta_02.htm

Have fun,

John

------------------------------------
Avanex
John Burke
Senior Manager RoHS Compliance
[log in to unmask]
40919 Encyclopedia Circle
Fremont
CA 94538
tel: 510 897 4250
fax: 510 979 0189
mobile: 510 676 6312
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Genny Gibbard
Sent: Thursday, July 14, 2005 1:12 PM
To: [log in to unmask]
Subject: Re: [TN] Cracked Passives


A quick search on their website produced
http://www.kemet.com/kemet/web/homepage/kfbk3.nsf/vaFeedbackFAQ?Searchview&Q
uery=(FIELD+feedbackProduct+contains+Ceramic)+AND+(FIELD+feedbackCategory+co
ntains+Cracking)&Start=1&Count=10&SearchOrder=1&SearchThesaurus=TRUE

Resulted in two articles
Additionally, if you look at the first article that comes up, it has links
to two more articles at the end.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Karen Ebner
Sent: 14-Jul-05 2:05 PM
To: [log in to unmask]
Subject: Re: [TN] Cracked Passives


They are at the top edges of the packages.  Please advise.

Where can I locate these articles from Kemet?

Karen Walters Ebner
Raytheon Electronic Combat Systems
Towson, MD 21286
410.583.4082



"Stolar, Paul W" <[log in to unmask]>
07/14/2005 03:42 PM

To
"TechNet E-Mail Forum" <[log in to unmask]>, "Karen Walters Ebner"
<[log in to unmask]>
cc

Subject
RE: [TN] Cracked Passives






Kemet has some great articles in this.

Where are the cracks?

Cracks in the middle are either flex cracks or problems wit the pick and
place (or some other applied force.)

Cracks at the ends are usually from thermal stress? (soldering irons)

Paul Stolar
Materials/Reliability Engineer
Manufacturing Reliability Lead Engineer
Baker Atlas
713-625-5376


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Karen Walters Ebner
Sent: Thursday, July 14, 2005 1:31 PM
To: [log in to unmask]
Subject: [TN] Cracked Passives

Would anyone list for me in most probable order the causes for cracked
capacitors.  Has anyone had issues with cracked caps with SnAg Solder
paste????

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