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Thu, 25 May 2000 16:36:00 +0000 |
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Tom,
IPC-2221 has a guideline; section 4.6 says "Liquid screened markings
require clearances that are typically 0.4 - 0.5 mm from solderable
surfaces." 0.016 to 0.020" is typically a lot for the dense boards we do
today.
FYI: Mary Sugden and Mona Johnson did a 5-part article on PCB marking in
Printed Circuit Design, from 11/96 to 3/97. Therein they give a summary of
clearances (12/96, pg 45, under Summary), where they say 0.010" for premium
boards and 0.017" for standard. Good info in the series.
Hope that helps...
Roger M. Stoops, PCB Designer
Spectra Precision Inc. Ph: 937.233.8921
5475 Kellenburger Rd. 937.233.4574 ext
Dayton, OH 45424-1099 288
USA Fax: 937.233.7511
Member IPC
Designer's Council,
C.I.D.
"Hybiske, Tom"
<hybiske@GENERALATR To: [log in to unmask]
ONICS.COM> cc:
Sent by: TechNet Subject: [TN] Searching for IPC "marking" spec
<[log in to unmask]>
05/25/00 03:48 PM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to
"Hybiske, Tom"
Was wonder if anyone can point me to the IPC spec which specifically states
how close silk screen marking on a printed wiring board can be to land
areas?
Thanks,
Tom Hybiske
General Atronics Corporation
Wyndmoor, PA
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