Ken: Teardropping is a procedure used to increase PWB manufacturability by creating extra pad material to prevent drill breakout from the pad due to possible misregistration and layer thermal stretching between any specific routing layer and the nc drill layer. We don't include teardropping in part footprints, at least not yet. As far as specifying teardropping for BGA footprints IMHO I see no advantage as the size of the BGAs available today don't cover a large enough area for misregistration and layer thermal stretching to be an issue. Furthermore, teardropping is typically done as a post processing enhancement. I believe adding teardrops at the outset may limit routing resources to the point that a BGA may become unroutable to some degree. Do it at the end if at all. Patel wrote: > What is "Teardropping"? Please explain it with the pro's and con's. > > re, > ken patel > > At 11:12 AM 6/26/98 -0400, Kuczynski Michael wrote: > >Is anybody out there using "teardropping" on their BGA's footprints ? > > > >Any pro's/con's to doing this would be appreciated. > > > >Thanks In Advance, > > > >Michael Kuczynski 201-393-2122 (Phone) > >Allied Signal 201-393-6688 (Fax) > >688 Rt46E E/K4 > >Teterboro NJ 07608 > >[log in to unmask] > >[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 web site (http://jefry.ipc.org/forum.htm) for additional > information. > >For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > >################################################################ > > > > > ______________________________________________________ > Ken Patel Phone: (408) 490-6804 > 1708 McCarthy Blvd. Fax: (408) 490-6859 > Milpitas, CA 95035 Beeper: (888) 769-1808 > > ################################################################ > 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 web site (http://jefry.ipc.org/forum.htm) for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 > ################################################################ -- Have a Golden Day, Paul Anderson [log in to unmask] http://www.amherst.com/ ################################################################ 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 web site (http://jefry.ipc.org/forum.htm) for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################