NationalPackagingPCBFootprintfilessupportOctober11,2006PhilGibsonJeffPerryMartyGarrisonThisdocumentproposesaupgradestothecurrentPackagingFoldersareaoftheNational.comwebsitetoprimarilysupportdistribution(download)ofPCBFootprintfilesforvariousPCBCADtoolstoPCBdesignersdesigning-inNational.comICs.PCBFootprintsThepurposeofthisdocumentistodescribehowwewillmakePCBfootprintfilesavailabletoPCBdesignerswhoaredesigningwithNationaldevices.BackgroundMostofourdevicesarepackagedtobebuiltinto/ontoprintedcircuitboard(PCB)substrate.DesignersofPCBsuseCADsystemstoaddmechanicallyaccuratecomponentsymbolstoaphysicaldesignoftheirapplicationcircuit.Thesesystemsrequireamulti-layercomponentsymbolincludinglayersforthemetalfootprintshowingtheelectricalconnection,locationofholesforthrough–holepins,silk-screenlayersdescribingpinnamingandpackageorientation.(SamplePCBfootprintimagegoeshere.)PCBfootprintfilesfornationalpackagesareavailableinfileformatsspecifictothevariousCADtoolsi.e.,Altium(Protel),Orcad,Mentor(PADS),etc.CADvendorssupportPCBfootprintswithintheirsoftware.Usually,thesefootprintsareincompleteoroutofdate.AltiumDesigner6hasbuilt-inIPC-SM-782footprintlibrary.Also,AltiumDesigner6hasanIPCFootprintWizard.StandardSpecificationsSeeIPC-7351spec.UseCasesWithintheAltiumtool,howarecomponentsymbolpinsmappedbetweenPCBfootprintandtheschematicsymbol?UseCasesAdesignerwantstodesignacompletePCBhavingNationalpartsusingapopularCADtool.Whereonthesitedoesshegotogettheappropriateinformationandfiles.Step1.Navigatetonational.comLookingateitherthe“Design”sectionofthepageorthe“Design”pull-downmenu,thecustomershouldsee“Packaging”lineitem.Perhapswecouldadd“PCBfootprints”onthe“Packaging”line.ClickingonPackagingtakesthecustomertothePackagingpage.(seebelow).Step2.Onthepackagingpagethereshouldbea“Design”Section.IbelievethisisthesameasApplicationNotessection.…becomes“Design/ApplicationNotes”section.ChangetheApplicationNotessectionChangetitleofsectionto“de