Hi Ken & All -

Check IPC-6012 -- in my recollection, Class 2 allows up to 90 degrees of
breakout.

Regards - Kelly
-----Original Message-----
From: Ken Patel <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Wednesday, October 13, 1999 3:26 PM
Subject: Re: [TN] Reliability due to misregistration on inner layer


>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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