There are many different competing objectives here. I would consider your glue dispenser's capability to place 0603 dots. Typically 0805 is the optimal solution, assuming the suppliers of passives are slowly ramping down in 1206s and toward 0805. I think some packages are not available yet in the 0603. It all depends what passives you're using. Another question is whether double sided reflow is an option, making 0603s much easier to solder. This assumes also you have a relatively new placement machine - older ones will not handle 0603 with any cost-effective drop-rate. Mike -----Original Message----- From: Paul Truit [mailto:[log in to unmask]] Sent: Wednesday, August 21, 2002 3:14 PM To: [log in to unmask] Subject: [TN] Bottom side SMT passives What is the "preferred" size package of choice for wave soldering passives when board space in design layout forces the passives to the bottom side but the component count and lines/width spacing requirements are not tight? A: 1206 B: 0805 C: 0603 D: doesn't really matter my yield is best for any type I have my preference but just wanted to see how others feel in regard to this type of situation. -- Paul Truit, Mfg. Eng. RBB Systems, Inc. 4265C E. Lincolnway Wooster, OH 44691 Ph. (330) 567-2906 ext 514 Fax (330) 263-5324 Email: [log in to unmask] ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------