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Wed, 10 Sep 1997 09:28:13 -0500 |
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Try IPC-SM-782, Suface Mount Design and Land Pattern Standard. It is available through the IPC. $45 for member companies and $90 for nonmembers.
Contact the IPC Order Department at:
847/509-9700 phone
847/509-9798 fax
[log in to unmask] email
www.ipc.org internet
Lisa Williams
IPC Technical Staff
>>> Johannes Sivula <[log in to unmask]> 09/10/97 08:04AM >>>
Hi Techneters
Does anyone know a good site/book/source , commercial/non-commercial for
SMD footprints library.
I have been assigned to update our footprint library, and I am not
satisfied with footprints
given in data books of component suppliers. I presume that those
footprints are not optimized
for IR reflow, nor carefully experimented.
Does anyone know any mathematical formula to be used to check roughly
dimensions of a pad ?
We make multilayer FR4 boards, HAL/Immersion Gold finish, no clean flux,
which is probably causing solder
balls. This problem is coped by reducing the size of stensil apertures. How
much it can be reduced ?
Does anyone have comment on that ?
Thanks for your time and cooperation.
Brs,
Johannes Sivula, Reliability Engineer, Tellabs Oy,
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