. . . sorry for shooting a blank there - mouse finger not engaged to brain syndrome - double clicking the "Reply" button will do it every time . . . Allen and the group, Some of these responses are right on point, such as the different design critera for different design perspectives, such as power supply verses high speed design, but then again some of these responses are even getting hard for me to comprehend, but one question that keeps comming to my mind, that appears to be popping up but not dealt with, is whether or not there are any controlled impedance traces are being used, since there the "stack up" will dictate the actual trace width. Is this a factor? JaMi ----- Original Message ----- From: "Allen T. Maddox" <[log in to unmask]> To: <[log in to unmask]> Sent: Friday, July 29, 2005 7:57 AM Subject: Re: [DC] Trace width ratio to pad Yes, this is the train of thought and the argument for wider traces. But is it necessary for all nets? Allen Maddox C.I.D. Sr. PC Board Designer GAI-Tronics, Corp 610-796-5854 PO Box 1060 Reading, PA 19607-1060 [log in to unmask] www.gai-tronics.com >>> [log in to unmask] 07/29/05 10:45AM >>> Ummm, I'm not so sure about Joe's statement. Shouldn't that read "more copper will give less resistance and result in less impedance (less inductance, more capacitance) all else being the same?" Roger -----Original Message----- From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Matthew Lamkin Sent: Friday, July 29, 2005 10:32 AM To: [log in to unmask] Subject: Re: [DC] Trace width ratio to pad Ah, that's it, bamboozle him with his own techno babble.. Now that's the best suggestion yet. You can also get the assembly department to define their preferences and whatever assembly want is usually enough to make it a law written in stone :-) <snip> For Signal traces you might what to use the argument that more copper will give him more resistance and actually will cause more impedance to the rise time on his circuit. This may cause him to rethink his request. Sometimes if you talk their language you can get your point across without having to use other drastic measures. ;-) Joe J. - C.I.D. <snip> --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 --------------------------------------------------------------------------------- ******************************************************************* This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept for the presence of computer viruses. www.hubbell.com - Hubbell Incorporated --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ---------------------------------------------------------------------------------