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In a message dated 02/22/2000 12:30:42 PM Central Standard Time,
[log in to unmask] writes:
<< Has anyone used square apertures for micro-BGA ? What are the advantages
over round apertures ?
Thanks.
Gener Arciaga
Manufacturing Engineer
Aimtronics Corporation (Delta, BC)
Direct (604) 940-5751
Pager (604) 296-8632
[log in to unmask] <mailto:[log in to unmask]> >>
Hi Gener!
Yep, I do...that's all I use. You get a few things; 1). Better paste release
from the stencil. 2). A teeny bit more volume for the joints (make the square
dimension the same diameter as your pads) 3). A little bit of "slop-factor"
for placement, as long as the balls are in the paste, the part will
self-center during reflow.
I originally got this from Tessera's web page (http://www.tessera.com) and
tried it, had so much good results with squares I use it everytime now...
-Steve Gregory-
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