Opps! Now I see the subject of your message: SMD on Bottomside. Why in the world would someone want to put it there?!? Hmm, that is out of my ballpark. I'm sure you can get a special slective soldering fixture to protect the QFP, but I don't know who makes them right off the top of my head. Can you plug the parts in from the bottom side and build the board in a mirror image maybe?? : > ) "Hamilton, Richard -4454" <[log in to unmask]> on 09/01/98 03:42:38 PM Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to "Hamilton, Richard -4454" <[log in to unmask]> To: [log in to unmask] cc: (bcc: Charles Barker/US/I-O INC) Subject: [TN] SMD on bottomside Hello all, I am looking for feedback on anyones experience in dual mode (SM and TH) manufacturing. We have one SM device, QFP, located in the middle of the PWB with other components surrounding it. We want to reflow the QFP, and then do other placements and then wave solder. We are evaluating masking methods for the QFP in the wave process. I would appreciate any feedback on methods tried, and results experienced. If you have a very positive experience with a specific vendor, I would not mind receiving that info also. I appreciate in advance the response and your time in this. Richard Hamilton Clemar Mfg. / Rain Bird [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 ################################################################ ################################################################ 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 ################################################################