Steve,
Only things I can tell you is that we have a 90 degree break out. The
material used was a 170 Tg on a 12 layer board. I don't know about any
violation of minimum lines and spaces standards, is it something we should
measure or expect our fab house to tell us?

re,
ken patel

At 07:17 PM 10/12/1999 EDT, [log in to unmask] wrote:
>In a message dated 10/12/99 5:51:38 PM Central Daylight Time, [log in to unmask]
>writes:
>
>> On one of our product, we have found that one of the inner layer has
>>  misregistration.
>>
>>  Do you see any quality/ long term reliability problem associated with inner
>>  layer misregistration? Our requirement was to have a 1 mil minimum annular
>>  ring on all inner layers. What is the risk cum liability of accepting those
>>  boards knowing that they are misregistered.
>>
>>  Misregistration occurred at 1mm BGA where the finished hole diameter is 9
>>  mil on a 20 mil pads.
>>
>>  re,
>>  ken patel
>
>Ken,
>
>As one who is learning, and one who has experienced some bare board problems
>recently, I would like to ask a question or two to clarify...
>
>1. Are you seeing break-out? No complete anular ring at all, just partial?
>
>2. What is the laminate material of the board? How many layers? Does this
>mis-registration violate any other minimum lines and spaces standards? Or is
>it just a problem of incomplete anular pads?
>
>Thanks,
>
>-Steve Gregory-
>
>
______________________________________________________
Ken Patel                       Phone:  (408) 490-6804
1708 McCarthy Blvd.             Fax:    (408) 490-6859
Milpitas, CA 95035              Beeper: (888) 769-1808

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