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September 1999

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Subject:
Re: Hot: Copper plating thickness -Reply
From:
Gabriela Bogdan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 29 Sep 1999 23:54:26 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (114 lines) 
Hi!
The lady from the lab asks, isn't it true that besides of the minimum average, IPC
specifies also the local allowable minimum along the hole wall?
The problem seems simple to me!
Gaby

pod wrote:

> Minimum is still minimum. Average is still average. Other requirements must
> be considered as we all know. Some are two voids in the same plain as
> unacceptable, those elements reducing hole wall plating thickness below that
> specified (glass fiber protrusion and so on). This is age old stuff and the
> lady from the lab, or? knows the stuff.
>
> Earl Moon
> ----- Original Message -----
> From: Alain Savard <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, September 29, 1999 11:32 AM
> Subject: [TN] Hot: Copper plating thickness -Reply
>
> > Hi Ken,
> >
> >   Verify the thickness as per IPC-TM-650, method number 2.1.1. This is
> suggested
> > by the IPC A-600, section 3.3.6.
> >
> >   Verify also IPC-6012, section 3.2.6.2 and table 3-2 (under average
> copper, and
> > minimum thin areas).
> >
> >   Although in the present case, it does seem like a reject.
> >
> > Alain Savard, B.Sc.
> > CAE Electronics Ltd.
> >
> > >>> Ken Patel <[log in to unmask]> 09/29/99 01:42pm >>>
> > 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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