Hi Ken,

Personally, I really don't care what the spec says. I for one would never
knowingly  ship .0004 of copper to my Customer and surely wouldn't try and
defend it by using the spec average.  I understand that a hole wall with
only .0004"  of copper plating ( thin spots ) can be a serious reliability
concern. It also can manifest itself into blow holes.

Just my opinion.

Ed Cosper
ABC


----- Original Message -----
From: Ken Patel <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, September 29, 1999 1:42 PM
Subject: [TN] Hot: Copper plating thickness


> If my requirement for the copper plating is 0.001" minimum (as spelled out
> on my fab drawing) and if I am reading it between .0004"-.001", is it
> rejects or not?. I tried to look at IPC-6012 which is calling out avg
copper
> thickness. I don't how easy to get ave #. This is clearly a reject to me.
> But I am looking for an expert opinion on the subject. Via Hole in
question
> is 16 mil +3 mil / -10 mils.
>
> re,
> ken patel
> ______________________________________________________
> Ken Patel                       Phone:  (408) 490-6804
> 1708 McCarthy Blvd.             Fax:    (408) 490-6859
> Milpitas, CA 95035              Beeper: (888) 769-1808
>
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