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-qekPo0dSdojgHmf1j0I93aRoPQ_075MIyMMHczN6jFK_8I9LfzAm4PhOrKrGoxYiW7QAhxYrlrxqhUaAJrw09JxNMQsCQmnTAT673hPsSOUrdbos96BQQg2lllGM-4Ph1eFEw6WJMDa14Qg2h_X7omYTfM-ub7Xa1J4SyrojvvovvjdO0rk

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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