Jack,
Mounting Holes have a placement courtyard just like any other footprint.
Consider Mounting Holes just like any other component. As long as you've
compensated for the hole slop for the screw and the washer hole slop
tolerances and placed your placement courtyard 0.25 mm (10 mils) larger than
the total slop everything will be fine.
You can't find any recommendations in an IPC spec because it does exist.
There is no reason to do anything different than normal component to
component spacing rules.
Tom
Tom Hausherr
President
13730 Sorbonne Court
San Diego, CA 92128
858.592.4826 Office
858.859.5371 Cell
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-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Robert
Wolfe
Sent: Tuesday, January 15, 2013 7:52 AM
To: [log in to unmask]
Subject: Re: [DC] Component to Mounting Clearance
The only references to mounting hole clearances I roughly remember seeing
were only related to the electrical clearance. So one would have to do the
math with tolerances hole Hole size vs screw head & washers sizes to
determine worst case so there would be The MIN required electrical clearance
per the design. I don't remember seeing anything related To mechanical
reasons other that ya gotta make it fit without interference based on
Assembly requirements (insertion machine, placement machine, test machine
requirements etc) of any parts in the design.
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack
Olson
Sent: Tuesday, January 15, 2013 10:44 AM
To: [log in to unmask]
Subject: [DC] Component to Mounting Clearance
Is there any guidance in IPC publications about acceptable clearance between
components and mounting hardware? I can't find anything, but one of our
designs has a QFP144 near a screw (more than 100 mils), and someone is
wondering if it will be a problem.
Here is a partial picture:
https://console.mxlogic.com/redir/?hPPPbUVZcSMC--M-qekPo0dSdojgHmf1j0I93aRoP
Q_075MIyMMHczN6jFK_8I9LfzAm4PhOrKrGoxYiW7QAhxYrlrxqhUaAJrw09JxNMQsCQmnTAT673
hPsSOUrdbos96BQQg2lllGM-4Ph1eFEw6WJMDa14Qg2h_X7omYTfM-ub7Xa1J4SyrojvvovvjdO0
rk
There's also a crystal to the left of the mounting hole, and they were
wondering about that one, too. Should I be worried?
(always feelin' like "the new guy")
Jack
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