Folks,
Is there a method of determining the maximum permissible size of two board
types?
a) A SMT PCB containing Fine pitch QFP devices
b) A SMT PCB containing PBGA 388pin 1.27mm pitch & Fine pitch QFPs
with respect to Bow and Twist.
I am interested in how the thickness of the board relates to maximum bow
and twist.
I'd like to determine this before I design the layout, rather than find out
it is wrong
after performing the tests of IPC-6012A, IPC-TM-650 2.4.22.
Regards,
Colin Weber
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