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1995

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"PULVINO, DENNY" <[log in to unmask]>
Date:
Tue, 17 Oct 95 13:32:16 PST
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     YOUR SUCH A STAR.....


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Subject: Re: Non-Functional Pads?
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Date:    10/17/95 10:58 AM


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From: "COCHRANE, ALAN" <[log in to unmask]> 
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Subject: Re: Non-Functional Pads?
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     Kevin,
     
     I would think that if a vendor were to remove the non functional pads 
     then they would let the end user know.  As you know I feel that non 
     functional pads are VERY benificial in the fabrication of boards.
     
     1. More retained surface copper = improved or better controlled 
     dimensional stability
     
     2.Complete pad stack to verify via x-ray, drill alignment
     
     3.Complete pad stack to verify registration/misregistration via 
     x-section.
     
     4.Copper to minimize the amount of drill splay specificly on thick 
     boards.
     
     5. Additional copper to help remove epoxy build-up in the drill flutes
     
     6. Extra interconnects to help deliniate the amount of z-axis 
     expansion and the stress on the interconnects.
     
     The only possible negative that I see is on some high speed designs 
     where x-talk/coupling is a factor.  If we remove the pads we can 
     increase the space from drill hole to trace.
     
     I have heard alot of people say "why have more potential for shorts if 
     I don't need to."  I would say to them "get a better AOI system"
     
     Regards,
     
     Alan B. Cochrane
     Director of New Technology
     Multek Inc.
     
     
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Subject: Non-Functional Pads?
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Date:    10/17/95 10:04 AM
     
     
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From: "Thorson, Kevin J @EAG" <[log in to unmask]> 
To: "'IPC Technical Forum'" <[log in to unmask]>
Subject: Non-Functional Pads?
Date: Tue, 17 Oct 95 10:01:00 CST
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The design guides for MIL-STD-275 and IPC-D-275 require non-functional pads 
on all layers of a multilayer PWB.  Can manufacturers remove them an their 
judgment?
     
If anyone knows the verse and script, that would be great.
     
Thank you in advance,
Kevin Thorson
Loral Defense Systems - Eagan
     
     



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