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April 1998

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Subject:
From:
Alvin Leong <[log in to unmask]>
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Date:
Fri, 10 Apr 1998 22:12:52 +0800
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Hi
        I'm begin to use the BGA package soon..anyone can tell me the criteria
look on these BGA. What was i understand :-

1.      misalignment? what is the % like?
2.      Void ? what is the % allowable? What is the phenomenom & root?
3.      Ball Diameter ? assume is 32mil. what is the optimum readout?
        what is the root cause? if a bigger diameter obtain, it mean?
        and how about a smaller diameter?
4.      Z-height? assume is 24 mils in raw. What is the root &
        countermeasure?

The question sound stupid but I'm believe there must be some expertise
inside this world.

thankx in advance
Alvin

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