What voltage of your application?  Some of hid operated at blow 4v. 1.8 are common.  If you are working on 18v, I would be a bit of worry. 
--------------------------
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----- Original Message -----
From: John Foster [mailto:[log in to unmask]]
Sent: Tuesday, September 18, 2012 09:03 PM
To: [log in to unmask] <[log in to unmask]>
Subject: [TN] question about 6012

I am curious about the 3.543 uin dielectric spacing recommendation in
6012C 3.6.2.15. I have to believe that this

Number did not just come out of thin air. I have been searching for any
long term reliability issues related to going below this number. I know
that HDI structures and embedded capacitors use very thin dielectrics
and the spec recommends low profile copper when going below this number.
We are doing Class 3 boards  and I am just trying to make sure I am not
shooting myself in the head going below this number. 

Thanks in advance


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