There is help in IPC-SM-782A section 3.6.1.7 Component Stand Off Height for Cleaning and the associated table 3-7. The stand off recommendation varies with the component size. For example small component < 3mm x 3mm stand off > 0.05 mm. A large component 50mm x 50 mm stand off > 0.5 mm. > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian > Sent: Thursday, March 20, 2003 12:56 PM > To: [log in to unmask] > Subject: [TN] SMT Component Standoffs > > > TechNetters, > When I was at a former employer there was a minimum stand off > in the company specs. I have forgotten what that was. Now I > know that it can/should be different based on the solder, use > environment, pad sizes and lead/termination materials, but I > was wondering if anyone would be willing to share what they > have on the subject. I am particularly interested in land > grid array devices, if I may be so bold as to be picky. :) > Thanks in advance. > Bev Christian > Research in Motion > > --------------------------------------------------- > 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 -----------------------------------------------------