Lee,

Do you also have any inromation about max Cu thickness in the PTH? In
the recent past we had some cracks and the min was ok but the max showed
values aroung .045mm. Our supplier said that the crack was caused due to
too thick copper. The crack location was on the top just below the Cu
ring.
Do you or anybody else has a suggestion how to handle or specify this?

Regards
Ralph

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee parker
Sent: Friday, July 20, 2007 10:42 PM
To: [log in to unmask]
Subject: Re: [TN] Question on plated through holes general

David

I always advise one mil or more in the PTH. Given the non-uniformity
often seen in the PTH I would also spec the drill quality and the ratio
of the copper at the top of the hole and in the center.

Best regards

Lee

J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389


----- Original Message -----
From: "David Harman" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, July 20, 2007 4:23 PM
Subject: [TN] Question on plated through holes general


I have a quick question and our standard that we have maybe an older
one. We currently use the ANSI/IPC-A-600 Rev E





Page 70   Micro section:



There is a table describing copper plating thickness min, requirements





                                                Class 1
Class 2                         Class 3

Average Min Thickness              .020mm (0.0008in)        0.025mm
(0.001 in)       0.025 mm (0.001 in)



Minimum this area                     .0015 mm( .0006 in)       0.020 mm
(.0008 in)     0.020mm  (.0008 in)







Can anyone tell me if this still is a current standards for  copper
plating thickness measurements.



David Harman




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