That was very Admirable of you catching my intended humor. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer Sent: Tuesday, January 15, 2013 9:49 AM To: [log in to unmask] Subject: Re: [TN] Mounting Hardware to QFP Component Lead At least you've corrected Dewey's Decimal! -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (EHCOE) Sent: Tuesday, January 15, 2013 11:41 AM To: [log in to unmask] Subject: [TN] FW: [TN] Mounting Hardware to QFP Component Lead My apologies. In switching to HTML format to use symbols, I missed my point (decimal , that is). I meant 0.25". It is much better to be diametrically opposed, than having you’re point missed altogether. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (EHCOE) Sent: Tuesday, January 15, 2013 9:25 AM To: [log in to unmask] Subject: Re: [TN] Mounting Hardware to QFP Component Lead There are many divine principles, disciplines, mandates and theoretical dogmas that have not made their way into IPC-2221, why would you expect this question, with all the good previously alluded to variables and potential mitigating scenarios, to be covered with a standard keep-out area? Since you asked again I'll accept your naiveté on this subject matter and state; 0.025 " keep-out clearance from edge of hole to nearest pad geometry. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson Sent: Tuesday, January 15, 2013 8:37 AM To: [log in to unmask]<mailto:[log in to unmask]> Subject: Re: [TN] Mounting Hardware to QFP Component Lead True, but I can't help but wonder if I'm missing something... Of all the issues that the IPC committees have discussed over the last few DECADES, why can't I find anything about mounting structures to component clearance? hmmm... dar's gotta be sumpn 'bout dat! thanks anyway, Jack . On Mon, 14 Jan 2013 19:16:27 +0000, Wayne Thayer <[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]:[log in to unmask]>>> wrote: >If it is a new QFP with the pure copper/very high copper leads then I wouldn't worry about it. Those leads are so compliant they can absorb amazing amounts of stress. > >Wayne Thayer > >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson >Sent: Monday, January 14, 2013 11:36 AM >To: >[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]: >[log in to unmask]>> >Subject: [TN] Mounting Hardware to QFP Component Lead > >To the assembly professionals out there: > >Have you ever had reliability issues with mounting screws if they are near a Quad Flat-Pack? My 144 pin land pattern is pretty close (100mils) but we are mounting the board into a very flat structure (no bowing) I can't imagine the compression of the board material could affect gull-wing style lead connections (maybe BGA?) but I don't know... > >thanks, >Jack > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask]<mailto:[log in to unmask]> ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________