<[log in to unmask]> Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginalArrivalTime: 25 Jun 2009 08:47:25.0495 (UTC) FILETIME=[9020D470:01C9F571] X-NAI-Spam-Level: * X-NAI-Spam-Score: 1 X-NAI-Spam-Report: 2 Rules triggered * 1 -- BAD_EMAIL_ADDRESS -- BODY: Contains a suspect email address * 0 -- RV3304 -- BODY: Version number Genny=2C I agree with Dorothy=2C refresh the immersion tin surface. It's no problem to do so=2C simply send it to a PCB shop for Sn refresh. Simon ---------------------------------------- > Date: Wed=2C 24 Jun 2009 10:10:19 -0700 > From: [log in to unmask] > Subject: Re: [TN] Immersion Tin solderability eval > To: [log in to unmask] > > Genny=2C > > I have customers that when their immersion tin PCB has sat so many > months on the shelf no matter how well it is stored it is sent back to > the PCB maker to be re-tinned/plated. It takes only one pad to ruin your > day. The smaller the pad the more likely a problem. > > Dorothy Lush > Fine Pitch a Flextronics Company > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker=2C Dewey > (EHCOE) > Sent: Wednesday=2C June 24=2C 2009 9:43 AM > To: [log in to unmask] > Subject: Re: [TN] Immersion Tin solderability eval > > Genny=2C > You have to go with the flow. Sometimes localized hand soldering will > give you a false positive. If you want to know whether to use them or > not=2C sacrifice a few and run them though all the subsequent processes > (especially thermal excursions) they would be exposed to in order to > establish an expected level of success. If you have to have an official > reason=3B test them per IPC J-STD-003 for solderability. > Dewey > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard > Sent: Wednesday=2C June 24=2C 2009 9:16 AM > To: [log in to unmask] > Subject: [TN] Immersion Tin solderability eval > > We have some Immersion Tin boards that are several years old. From > everything I have read here or elsewhere=2C ImmSn is supposed to have a > short shelf life. 6 mos to a year. No one wants to scrap the boards > without testing them=2C though. > How would you verify whether they are still good? We hand-soldered some > pads and actually had no problems which surprised me=2C considering the > age of the boards=2C but I don't know if that is a valid test. > > Genny _________________________________________________________________ Sommerferien mit vielen Digitalfotos geplant? Hier weitere Infos zur einfac= hen Foto-Bearbeitung und -Verwaltung! http://www.microsoft.com/switzerland/windows/de/windowslive/products/photo-= gallery.aspx= --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 -----------------------------------------------------