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March 2009

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From:
kwood716 <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, kwood716 <[log in to unmask]>
Date:
Wed, 4 Mar 2009 11:25:19 -0500
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Hi,
I have the IPC2221A table in my program.

http://saturnpcb.com/pcb_toolkit.htm

If you just need a distance from hole to copper without regard for
electrical issues then this becomes a standard
spacing issue, right? I would stay 50mils away from any mounting holes but
it depends on the design.

Hope this helps...
Ken



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of GRIVON Arnaud
Sent: Wednesday, March 04, 2009 5:38 AM
To: [log in to unmask]
Subject: [TN] PTV to Ground Clearance

Hello TechNet,

For those who are familiar with IPC-2221 and IPC-2222 standards : what are
the recommended clearances between a PTV/PTH and an internal PCB ground
plane?
IPC-2222 §9.1.3 'Clearance area in plane' includes a picture with an 'A+B' 
distance corresponding to the summation of the electrical clearance and the
manufacturing tolerances, but I cannot find any numerical values.
Can somebody help?
I am primarily interested in the case of an unsupported hole without NFP in
a ground plane.
Thanks in advance for your insights.
Best regards,

A. Grivon

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