Dave, Are you sure about the 10 years/ Could it be more like 6-7 years? The first knowlede I had about immersion silver wass from the SSTC Conbference at the NPL in Oct 1996. Anyway what's a couple of years, the result is the same immersion silver works. My old employer was in volume production of immersion silver assemblies since 1997 and immersion silver is the surface finish of choice in my new company. Regards, George George M. Wenger (908)-546-4531 Reliability Engineer RF Power Amplifier Group Andrew Corporation, 40 Technology Drive, Warren, NJ 07059 [log in to unmask] -----Original Message----- From: Dave Hillman [mailto:[log in to unmask]] Sent: Thursday, August 28, 2003 3:18 PM To: [log in to unmask] Subject: Re: [TN] Immersion Silver vs. White Tin Hi Jim! We have done a bunch of testing and have found that the immersion silver finish does not impact the solder joint reliability for a controlled soldering process. We published the BGA data at the IPC APEX 2000 meeting in Long Beach (the paper should be listed in the proceedings). We have also been producing an immersion silver assembly for 10 years for a military customer with no issues. Nothing solders like solder but immersion silver isn't too far behind. Dave Hillman Rockwell Collins [log in to unmask] "Marsico, James" <James.Marsico@DP To: [log in to unmask] .AIL.COM> cc: Sent by: TechNet Subject: Re: [TN] Immersion Silver vs. White Tin <[log in to unmask]> 08/28/2003 11:59 AM Please respond to "TechNet E-Mail Forum."; Please respond to "Marsico, James" Just out of curiosity, does the immersion silver effect long term reliability of tin-lead solder joints? Jim Marsico Senior Engineer Production Engineering EDO Electronics Systems Group [log in to unmask] <mailto:[log in to unmask]> 631-595-5879 -----Original Message----- From: Dave Chapman [SMTP:[log in to unmask]] Sent: Thursday, August 28, 2003 12:53 PM To: [log in to unmask] Subject: Re: [TN] Immersion Silver vs. White Tin Agreed, Immersion Silver was a drop in replacement both at reflow and wave. Silver was lower cost or same as HASL. Only caution, the joints do look different than HASL boards so education rather than rejection is the word of the day. As with all alternate finish boards handling is important, hands off the board, slip sheets needed on only the top and bottom boards since the finish is actually below the surface of the solder mask so no big risk of scratching) in vacuum sealed bags, remove from packaging just before processing, don't let sit on the shelf unless fully processed, don't wait 3-4 weeks to run through the wave after SMT because you may see tarnish, although solderability is still good, statistically the sooner processed the better. White Tin we had to go to higher temp profile and watch every step. Congratulations on going to Lead Free PCB's Dave Chapman -----Original Message----- From: Bill DeCray [mailto:[log in to unmask]] Sent: Thursday, August 28, 2003 11:34 AM To: [log in to unmask] Subject: Re: [TN] Immersion Silver vs. White Tin Immersion silver would be the best choice Highest Regards William W. DeCray III Sales Engineering Manager Waytec Electronics Corp. Phone: (434) 237-6391 Ext 115 Fax: (434) 237-1324 Cell: (434) 851-6115 E-mail [log in to unmask] Website www.waytec.com -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory Sent: Thursday, August 28, 2003 11:31 AM To: [log in to unmask] Subject: [TN] Immersion Silver vs. White Tin Hi All! Got a customer that's calling out on the fab drawing, either Immersion Silver or White Tin for a board finish. Me, not having great deal of experience with either one (yet), am wondering if I had to choose, which one would I choose? Have any of you worked with both, and have a preference of one over the other? Why? As always, thanks in advance! -Steve Gregory- --------------------------------------------------- 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- ------------------------------------------------------------------------------------------------ This message is for the designated recipient only and may contain privileged, proprietary, or otherwise private information. 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