TECHNET Archives

November 2009

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joyce Koo <[log in to unmask]>
Date:
Wed, 25 Nov 2009 11:19:09 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (52 lines)
Yes.  Specially, thined die.  
--------------------------
Sent using BlackBerry


----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Wed Nov 25 11:03:09 2009
Subject: [TN] Preparing for microvia examination

Schrekxscht!
That was the way the aliens from planet Mars saluted us in the funny film
that ended in their heads exploding when a guy played Elvis Presley on his
car radio. What does that have to do with microvias?  Anyone with experience
from cutting a board into small pieces and mold them in epoxy for cross
section analysis? I use a thin blade, high rpm diamond blade for cutting.
The board was equipped with SuperBGAs down to smallest QFNs. We suspected
via problems and looked for such after polishing. In fact we found extremly
good barrels and no sign of via issues. Instead we saw that some
cross-sectioned semi chips had fine microcracks. In some cases, the
microcrack ran all the way across the chip, i.e. the whole active area was
more or less separated from the rest of the chip.My q is this:  has anyone
of you got microcracks in the semi chips caused during the cutting
operation? I,ve cross sectioned hundreds of boards during my time here, but
never seen cracks like these be caused by the diamond cutting. Can there be
a Schrekxscht when you use the diamond saw?
/Inge

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

---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.

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

ATOM RSS1 RSS2