Cris Ball, You sounds like one of those assembly people who say " we assembled boards this way for 20 years. Why we have to change that way" Excuse myself for side tracking. I don't get your point. You did say wave pad is 2/3 of component width for 15 years. That is basically what IPC-SM-782 recommends for wavesoldering chips. Check at the bottom page of subsection 8.1, subject chip resistors. It also says about stretching wave pad in Y-axis as well. regards Matthew Park NII-Norsat International Inc. >>> Chris Ball <[log in to unmask]> September 24, 1998 5:59 am >>> Hello all, Mary. We wave solder a lot of 1206's. Our standard pad config is 2/3 the width of the part and has been for about 15 years. Every year or so, someone comes along and says we should change our pads to 'IPC Standards'. Where is it documented that the footprint should be 2/3 of the width of the part? It would be nice to have a better response than "trust me, this is what you want". Thanks, Chris Ball ITT Automotive (formerly Delco Chassis/ soon to be Valeo) ................. A different footprint is required for wave soldering than is for reflow soldering. The wave solder footprint must be narrower to minimize the amount of solder that is retained. For wave soldering, the width of the footprint should only be 2/3 of the width of the part. During wavesoldering, the solder should form a nice concave and feathered joint at each end of the component. The solder joint should not be bulged nor should it build up over the top of the termination. .................. ################################################################ DesignerCouncil 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 DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ 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 ################################################################ ################################################################ DesignerCouncil 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 DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ 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 ################################################################