Hello Paul,

We reference IPC-7351-A. The following are some suggestions for your
consideration:
1- Use optimized component land design
2- Design the board with suspect components in the same direction and
reflow them such that both sides of the component lead are hated at the
same time
3- Monitor the solder paste volume, they should be within the process
capabilities for both termination

Paymon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Black, Paul
Sent: April 2, 2007 11:13 AM
To: [log in to unmask]
Subject: Re: [TN] Tombstoning MELF

Good Morning Everyone,

I have a tombstoning problem with a MELF resistor. This board is built
in-house and also by a CM, and the problem exists in both processes. I
suspect the problem is the design of the pads. They are twice the length
and width of the MELF area that contacts the pad. This is the
recommended design of the manufacturer of the part. Can anyone point me
to any IPC spec or share their knowledge to get me going in the right
direction?

Thank you,
Paul Black
Manufacturing Engineer
Kronos Incorporated

---------------------------------------------------
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
-----------------------------------------------------

---------------------------------------------------------------------------------------
Confidentiality Notice

This e-mail and any attachment(s) are intended for the individual or entity to which this email is addressed and may contain information that is confidential.  If you are not the intended recipient or an employee or agent responsible for delivering this e-mail to the intended recipient, please be aware that any dissemination, distribution or copying of this communication is strictly prohibited.  If you have received this in error, please notify the sender by telephone at 604.430.4336 or by return e-mail, and please delete or destroy all copies of this communication.  Thank you!

---------------------------------------------------
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
-----------------------------------------------------