Phil,

I have double reflowed many tantalum capacitors and have not seen any
issues.  You should ask your customer for the data they have that shows this
to be an issue.

Regards,
John

John Koleszar
Saline Lectronics, Inc.
710 N. Maple Rd.
Saline, MI 48176
517.962.8735
[log in to unmask]

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Bavaro
Sent: Thursday, January 27, 2011 4:25 PM
To: [log in to unmask]
Subject: [TN] Tantalum Capacitors and double sided reflow

I recently heard from a customer who is concerned about our designs
having tantalum caps on the second side of double sided Sn63Pb37 circuit
card assemblies.

 

This is news to me but maybe something has happened in the world that I
missed.....wouldn't be the first time.

 

In a nutshell, I am hearing that tantalums cannot be reflowed
twice....yet I read in Kemet literature that the reliability specs are
based on three time reflows for resistance to soldering heat.

 

And I have reflowed tantalums at lead free temperatures as well without
seeing failures.

 

Any help would be appreciated.

 

Phil

 

 


----------------------------------------------------------------------------
--
This message and any attachments are solely for the use of the addressee and
may contain L-3 proprietary information that may also be defined as USG
export controlled technical data. If you are not the intended recipient, any
disclosure, use or distribution of its content is prohibited. Please notify
the sender by reply e-mail and immediately delete this message and any
attachments.




______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
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.aspx?Pageid=E-mail-Forums for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------


______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
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.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------