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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
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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
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