Ernst,

Can you be more specific to as what you consider a defect..if bridging,
component placement and insufficient/non-wetting are your only criteria then 96%
seems low even for prototype development.....but that depends on the quality of
your BGA devices as well....
Marcelo

-----Original Message-----
        From:   Wallisch, Ernst [SMTP:[log in to unmask]]
        Sent:   Thursday, June 11, 1998 11:26 AM
        To:     [log in to unmask]
        Subject:        [TN] BGA First Time Yields
        Importance:     High

        Fellow Technetters,

                I am fairly new to the world of BGAs and we have only built
limited
        quantities of CCAs with BGAs (388s and 352s on 17 layer PWBs) for
internal
        customers.  I am seeing a first time yield of approximately 96%.

                Is this particularly bad for a low to mid volume environment?
What
        kinds of FTY are other folks achieving?

        Thanks in advance,

        Ernst Wallisch
        Manufacturing Engineering
        Computing Devices Canada
        [log in to unmask]
        (613) 596-7536

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