"Wolfe, Robert" wrote: > > Neckdown is a term used when a trace needs to be less wide in an area to get > through pad/lands or just for pad entry because of solderability issues. > I.E. say a conductor trace on a board is being routed at .025 wide and you > need to get between two pads that have a .020 clearance between them you > will need to neckdown the trace to say .008 wide. Or you are entering a .062 > pad with .10 trace and need to neckdown to say .040 close to the pad for > solderability. Longwinded but basically making a trace less wide for a short > distance to maintain design rule clearance or solderability. > Robert M. Wolfe > Hi Robert Why do you need to neckdown a trace when you enter a pad. Is this a DFA vaiolation,plz explain ? -- Best Regards Khaled H. Fouad ---------------------------------------------------------------------- Senior PCB Designer Research & Development Department International Electrical Products Member of BAHGAT Group Second Industrial Zone, Plot 240 6 October City, Egypt Tel. : +20 (11) 333414-9 Ext. : 312 Fax. : +20 (11) 335613 (Direct) +20 (11) 333420 WWW : http://www.bahgat.com Email: [log in to unmask] ---------------------------------------------------------------------- ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################