Technet;
As a designer, I diligently try
to understand and account for fabrication and assembly issues in my
designs. It can be frustrating when working with EE's that are not well versed
in manufacturing as they request things that you know are not good
practice from a DFM viewpoint.
I have a case now where an EE
is asking for a copper fill on BGA ground pins. Since this is not easy to
describe in a way that every one can understand, I am including a small JPG to
illustrate. It is a 356 pin BGA, 1mm pitch, 0.5mm solder lands.
I am convinced that this will
not fare well when they try to solder this part, yet the engineer insists on
doing it this way. What argument can I make, with supporting data, to persuade
him? Simply telling him that I know it is poor practice isn't cutting it!
[Adjusting tie..."I tell ya, we get no respect!"]
Denis Lefebvre, C.I.D.
Senior PCB Designer
408-542-3832
Finisar
Corporation
1308 Moffett Park Drive
Sunnyvale, CA 94086