At 12:45 AM 7/24/2009, Rex Waygood wrote: >Ummm. Not being an expert here but having seen sections of microvias I >would be inclined to put in a large safety factor. Ummm, unless they're conductive paste vias I wouldn't be too worried. :-) uVias are short and have all sorts of intimate contact with other copper and materials that sink off heat. Empirically, when we've done simulations/models and compared to actual builds they run much cooler. >Regards >Rex > >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of Dwight Mattix >Sent: 23 July 2009 19:53 >To: [log in to unmask] >Subject: Re: [TN] uVia Capacity > >IPC-2221 figure 6-4 "Conductor thickness and width for internal and >external layers." > >Use the magic of pi to figure the equivalent flat trace width, check vs >the charts and voila! If it's a solid copper filled uVia then look for >round wire equivalent. > >At 10:32 AM 7/23/2009, Kenneth Wood wrote: > >Hi, > > > >Does the IPC, or anyone, have current capacity numbers for micro vias? > > > >Thanks > > > >Ken > > > > > > > > > > > > > >--------------------------------------------------- > >Technet Mail List provided as a service by IPC using LISTSERV 15.0 To > >unsubscribe, send a message to [log in to unmask] with following text in > >the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt > >or (re-start) delivery of Technet send e-mail to > >[log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing > >per day of all the posts: send e-mail to > >[log in to unmask]: SET Technet Digest > >Search the archives of previous posts at: > >http://listserv.ipc.org/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 > >----------------------------------------------------- > >--------------------------------------------------- >Technet Mail List provided as a service by IPC using LISTSERV 15.0 To >unsubscribe, send a message to [log in to unmask] with following text in >the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or >(re-start) delivery of Technet send e-mail to [log in to unmask]: SET >Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the >posts: send e-mail to [log in to unmask]: SET Technet Digest Search the >archives of previous posts at: http://listserv.ipc.org/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 >----------------------------------------------------- > >--------------------------------------------------- >Technet Mail List provided as a service by IPC using LISTSERV 15.0 >To unsubscribe, send a message to [log in to unmask] with following text in >the BODY (NOT the subject field): SIGNOFF Technet >To temporarily halt or (re-start) delivery of Technet send e-mail to >[log in to unmask]: SET Technet NOMAIL or (MAIL) >To receive ONE mailing per day of all the posts: send e-mail to >[log in to unmask]: SET Technet Digest >Search the archives of previous posts at: http://listserv.ipc.org/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 >----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/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 -----------------------------------------------------