Thanks Happy, good point,
That would work, but I would end up using a single 0.0027 prepreg.
Here is the current stack up attached, if I leave the copper as is (1/2
oz all internal) and use 5 x 0.0027 will that still be stable/reliable
in BT?
John
John Burke
Senior Manager - Operations , Optichron
[log in to unmask]
W: 510 249 5233
M: 408 515 4992
http://www.optichron.com
Profile: https://www.linkedin.com/e/fps/2665502/
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Happy Holden
Sent: Saturday, January 21, 2006 6:40 AM
To: [log in to unmask]
Subject: Re: [TN] Laminate material
John,
Why not consider BT, which is what most BGAs are made from? It comes in
a
variety of thicknesses and prepregs, has a very high Tg & Td, and is
very
flat and smooth.
Happy Holden
Asian Pacific Materials
John Burke <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
01/20/2006 06:25 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
John Burke <[log in to unmask]>
To
[log in to unmask]
cc
Subject
[TN] Laminate material
I am using a standard 0.62 thick laminate 6 layers. The board size is
1.375 by 2 inches. It is a lead free assembly and is a little unusual in
that it has BGA and QFP components on the top, but is mounted with 300+
bga balls on the reverse side, so in effect is actually a component when
finished.
I am making this out of Polyclad 370HR, and have no coplanarity issues
with the finished product.
I have a request though to make the product thinner for one customer
application.
Anyone have suggestions on a material that could be mechanically stable
enough to reduce the current board thickness in order to achieve this -
as I said it needs BGA flatness and is assembled at 260 C twice by us
(components and ball attach) and once by the customer.
Thanks in advance,
John
---------------------------------------------------
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
-----------------------------------------------------
---------------------------------------------------
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
-----------------------------------------------------
|
