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March 2009

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Subject:
PTV to Ground Clearance
From:
GRIVON Arnaud <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, GRIVON Arnaud <[log in to unmask]>
Date:
Wed, 4 Mar 2009 04:38:10 -0600
Content-Type:
text/plain
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text/plain (26 lines) 
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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