Leland,
1) Not necessarily enough time
2) Different results with liquid water and vapor
3) Wouldn't trust anything short of acoustic microscopy for this
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Wednesday, May 26, 2010 3:31 PM
To: [log in to unmask]
Subject: [TN] MSD Devices and Popcorning
Just on a note of curiosity, how many folks out there are using a
sophisticated RFID process to track their MSD exposure times?
We're using a manual system, and lately I've had a couple of people
inquiring about moving to something much more expensive. In my ten
years here, we've never seen either an internal nor external failure due
to popcorning, micro cracks in our devices, or anything along those
lines.
A few years ago, I took 10 scrap ICs and soaked them in a glass of water
over a four day weekend. When we returned on a Tuesday, I pulled them
out, dried the surfaces off, and sent them through a lead free process
reflow oven on a bare board.
After everything I'd read and investigated, I expected them to explode.
I performed an intense examination of both sides of the components under
100X magnification, and I was extremely surprised to see no incidents of
popcorning nor package cracks. I then checked them in our X-ray
machine, and saw no evidence of any bond wire detachments.
Has anyone conducted a similar experiment with dissimilar results?
I'm just wondering if we're making a mountain out of a mole hill here...
Thanks,
Leland
______________________________________________________________________
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.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.
______________________________________________________________________
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.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
