Scott,
how on earth do you pronounce your name? The 'v' concerns me.
About CBGAs, we may be happy not listening to those stories, or we may be
stupid. In fact, we have been using ceramic parts (not only CBGAs) on FR-4
the last 20 years without any significant problems. The bumble bee can't
fly, says the calculating engineers, but it doesn't know that and just
flies. Extreme conditions, like immersion into cold liquids and back to
boiling liquids will probably cause cracks, but our products live an
ordinary MIL life. Old IBM supercomputers had ceramic items as big as 80x80
millimeters with up to 15,000 solder bumps, mounted on FR-4, and they
worked. I think I have some still somewhere. I'll see if I have still papers
from my work with CBGAs, many years have gone since that time.
Happy Holden may have more to say about CBGAs. At least he was very positive
to CBGAs when I listened to his CBGAs sessions hundred years ago.
But you need a 100% solder process guidance. And flat and well engineered
boards. CBGAs on warpy, commercial TV kit boards won't work, I think.
Nowadays, we use ceramic parts mostly for high power devices. As the
ceramic c.omponents are more expensive and sometimes risky (BeO), we try to
avoid them
Ingemar Hernefjord
Ericsson Microwave Systems
----- Original Message -----
From: "Scott Lefebvre" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, June 15, 2006 9:33 PM
Subject: [TN] CBGA Concerns
One of our engineers are looking at using a ceramic BGA (8mm x 8mm) 69
balls at .8mm pitch. I have stayed away from using CBGA's because of
there long history of not being very reliable. I am looking from advice
from my fellow technet readers on advice concerning this package.
Thanks in advance,
Scott Lefebvre
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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 1.8e
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
-----------------------------------------------------
|
