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May 2006

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Subject:
RE: [TN] Re: (瑞星提ç
From:
"Chezhian, Krishnan (Radhakrishnan)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Chezhian, Krishnan (Radhakrishnan) <[log in to unmask]>
Date:
Tue, 9 May 2006 15:46:57 +0800
Content-Type:
text/plain
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text/plain (1 lines) 
End of the day it all depends on the end application. We have built boards for the automotive industry where the edge to nearest copper feature is only 10mils, but the board is mounted on an aluminum casing & conformal coated so there is no shorting. Then you have the heavy copper jobs which they will not accept any exposed copper, again depends on the market it is being sold to, if it is Japan no way. Then you have the edge plated boards which have metal exposed all round the board, but this is for a different application. So end of the day it is application, customer, market segment etc.,

Thanks & Best Regards,
Krishnan C
SANMINA-SCI


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of ??
Sent: Tuesday, May 09, 2006 1:45 PM
To: [log in to unmask]
Subject: [TN] Re: (瑞星提示-æ¤é‚®ä»¶å¯èƒ½æ˜¯åžƒåœ¾é‚®ä»¶)Re: [TN] IPC Standard / PWB Router edge clearance

hi!  How are you ?
----- Original Message ----- 
From: "John Burke" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, May 09, 2006 7:44 AM
Subject: (瑞星提示-此邮件可能是垃圾邮件)Re: [TN] IPC Standard / PWB Router edge clearance


> Yes it will.
> 
> The interesting thing that I note is that no-one has commented on this from
> a CAF growth standpoint.
> 
> For 48 volt internal planes I have been advised that 3 mils drill to copper
> is a good bet. If you only had 10 mils at the rout edge to copper on a slide
> in card such as an internet switch blade, you would effectively have 10 mils
> copper (internal) to ground (on the card guide external).
> 
> Telecomms guys on the link what is your dimension for this?
> 
> John
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor G. Hernandez
> Sent: Monday, May 08, 2006 1:46 PM
> To: [log in to unmask]
> Subject: Re: [TN] IPC Standard / PWB Router edge clearance
> 
> Now the ball is rolling on this topic.   This is what I wanted to hear
> on the different guidelines out there besides IPC STD.   I will continue
> too solicit thoughts on this topic.   I feel that it is critical and
> eventually cause failures on card .
> 
> Victor,
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
> (AZ75)
> Sent: Monday, May 08, 2006 3:14 PM
> To: [log in to unmask]
> Subject: Re: [TN] IPC Standard
> 
> Yes and the conservative Aerospace approach added another .015 for all
> uses and routing-out( de-panelizing ) required a .015 profile tolerance
> so you ended up with an .040 design keep-out area from edge of PCB to
> any conductive edge.
> Dewey
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
> Sent: Monday, May 08, 2006 12:39 PM
> To: [log in to unmask]
> Subject: Re: [TN] IPC Standard
> 
> MSFC-STD-154 paragraph 5.1.1.3 - minimum edge clearance of conductors
> shall be .010".  Just for trivia.
> 
> MIL-STD-275 did call a .050" minimum or the use of a table based on
> voltage where inner and outer conductors have different criteria.
> 
> Jeffrey Bush
> Director, Quality Assurance and Technical Support VERMONT CIRCUITS
> INCORPORATED
>            76 Technology Drive - POB 1890
>               Brattleboro, Vermont 05302
>                 Voice - 802.257.4571 ext 21
>                     Fax - 802.257.0011
>                        <http://www.vtcircuits.com/>
> 
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
> Sent: Monday, May 08, 2006 9:51 AM
> To: [log in to unmask]
> Subject: Re: [TN] IPC Standard
> 
> Somewhere in the fabrication rules within the IPC specs is a .050"
> minimum requirement from all unfinished edges.
> This is to prevent exposed copper smears during routing of the PCB.
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
> Sent: Monday, May 08, 2006 7:25 AM
> To: [log in to unmask]
> Subject: Re: [TN] IPC Standard
> 
> Rule was a .010" sealed edge distance - I believe this comes from a
> defunct MIL Spec - but I cannot recall the document #.  Also - this is
> after the processing tolerances of the Fab house - you must add these to
> the .010" design rule.
> 
> Jeffrey Bush
> Director, Quality Assurance and Technical Support VERMONT CIRCUITS
> INCORPORATED
>            76 Technology Drive - POB 1890
>               Brattleboro, Vermont 05302
>                 Voice - 802.257.4571 ext 21
>                     Fax - 802.257.0011
>                        <http://www.vtcircuits.com/>
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor G. Hernandez
> Sent: Friday, May 05, 2006 2:46 PM
> To: [log in to unmask]
> Subject: [TN] IPC Standard
> 
> Fellow TechNetters
>    Where can I locate a related guideline of how close a copper plane
> and/or trace can come to the router edge of a PWB.
> 
> Victor,
> 
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