My request has generated a lot of input. I see that many have used the
term " sealed edge." Can someone care to elaborate on this statement.
My first thought is that the edge is router and not punched, frayed.
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
Sent: Tuesday, May 09, 2006 6:57 AM
To: [log in to unmask]
Subject: Re: [TN] IPC Standard
Actually the .015" was added to the spacing associated to peak voltage -
any where from .005" @ 100 VDC/AC to .1 mil/Volt >500/. So a
recommended edge distance for a 100 VDC utility would be .020". Since
the .015" is a "large" tolerance and today's number is .005", this is
where we arrive at the .010" minimum sealed edge distance. We simply add
additional tolerances as needed, scoring, special tools, material
stability, etc to arrive at the starting point.
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 Whittaker, Dewey
(AZ75)
Sent: Monday, May 08, 2006 4:14 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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