Different locations, identical caps placed along and normal to the board. :-)

Regards,

Vladimir

----- Original Message -----
From: Allen Maddox <[log in to unmask]>
To: TechNet E-Mail Forum <[log in to unmask]>; Igoshev, Vladimir
Sent: Mon Jul 14 11:19:16 2008
Subject: Re: [TN] Ceramic caps

Just curious if there is any consistency in the size of the cap or it's place on the board and direction it faces?
It seems like you've covered all the obvious failures so far.
 
Allen Maddox, CID+


"Igoshev, Vladimir" <[log in to unmask]> wrote:

	That was the first thing I asked and was told "No", they hadn't been re-worked or placed manually.
	
	What bugs me the most is that I have a hard time imagining how a top half of a cap can be separated from the bottom one. If it wasn't a manufacturing problem, then how it should have been loaded (mechanically) to crack like that.
	
	Regards,
	
	Vladimir
	
	----- Original Message -----
	From: TechNet 
	To: [log in to unmask] 
	Sent: Mon Jul 14 10:39:57 2008
	Subject: Re: [TN] Ceramic caps
	
	In addition to the very good info you have already received, consider
	how the caps are being soldered or reworked. I would check to make sure
	none were soldered by hand using conventional solder irons. Rework such
	as solder touchup should only be done with a hand-held hot air device
	such as a Hakko or JVC.
	Never, ever allow an MLCCC to be soldered with a conventional soldering
	tool, as the sudden thermal shock will crack the body of the connector,
	and/or the large heat transfer can melt the high-temp solder connections
	internally (plate to terminal connections). 
	
	-----Original Message-----
	From: TechNet [mailto:[log in to unmask]] On Behalf Of Igoshev, Vladimir
	Sent: Monday, July 14, 2008 8:08 AM
	To: [log in to unmask]
	Subject: [TN] Ceramic caps
	
	Hi TechNeters,
	
	I came across an unusual (at least to me) failure mode of ceramic caps.
	They crack along the component body in either normal (from top all the
	way through to the bottom), or parallel (from one side all the way
	through to the other side) direction to the board the caps are mounted
	on.
	
	Has anyone seen something similar?
	
	Thanks a lot in advance.
	
	Regards,
	
	Vladimir
	
	---------------------------------------------------
	Technet Mail List provided as a service by IPC using LISTSERV 15.0 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
	-----------------------------------------------------
	
	---------------------------------------------------
	Technet Mail List provided as a service by IPC using LISTSERV 15.0
	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
	-----------------------------------------------------