All, How is to detect black pad? Can it be inspected at PCB level? I guess no. Is it the after reflow soldering phenomena? Re, Ken Patel --- Werner Engelmaier <[log in to unmask]> wrote: > Hi Bob, > First, with ENIG you do not solder to gold, but to > the underlying nickel; > Second, soldering to Ni requires more thermal > energy, thus higher temperatures, and that is really > bad news on top of the T-increase necessary for > LF-solders; > Third, the 'black pad' issue will not go away with > LF-solderas,but actually may become worse. > Thus, Immersion Ag is a good choice. > Werner Engelmaier > > -----Original Message----- > From: Jeffrey Bush <[log in to unmask]> > To: [log in to unmask] > Sent: Wed, 27 Apr 2005 07:14:42 -0400 > Subject: Re: [TN] gold vs copper plating on pcb's > > > If you stick with ENIG and do not test Immersion > Silver then I am sure > you will be doing future testing to combat the > issues with ENIG. Monies > are being put into the development if silver and > several toughed > formulas are coming out that have excellent > resistance to TC and do not > have the issues associated with ENIG. OSP is also > seeing some > development, but I do not see this as a viable > alternative today. > > Jeffrey Bush > Director, Quality Assurance and Technical Support > > VERMONT CIRCUITS INCORPORATED > 76 Technology Drive - POB 1890 > Brattleboro, Vermont 05302 > Voice: 802.257.4571.21 Fax: 802.257.0011 > http://www.vtcircuits.com > > > -----Original Message----- > From: Bob Arciolla [mailto:[log in to unmask]] > Sent: Tuesday, April 26, 2005 4:41 PM > To: [log in to unmask] > Subject: [TN] gold vs copper plating on pcb's > > Good Afternoon all, > > Our company will be switching over to lead free and > we have received > sample pcb's from one of our vendors and one board > has gold (ENIG) for > the traces and one has copper (OSP). From some of > the emails I have seen > on Technet it appears that gold is what most of > companies are going to > be using? Is this correct or is there some other > materials we should be > looking into to use? Is the gold more reliable than > the copper? > Any input would be greatly appreciated. > > > --------------------------------------------------- > Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for > additional > information, or contact Keach Sasamori at > [log in to unmask] or 847-615-7100 > ext.2815 > ----------------------------------------------------- > Regards, Bob > > --------------------------------------------------- > Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for > additional information, or contact Keach Sasamori at > [log in to unmask] or > 847-615-7100 ext.2815 > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for > additional information, or contact Keach Sasamori at > [log in to unmask] or 847-615-7100 ext.2815 > ----------------------------------------------------- > --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------