But TN does have two Hillmans, Craig and Dave. Must be from Fortran equation stating: Iff surname = Hillman, then goto Very Smart Guy. Gotta be the genetics connection. Sure to be some Scandihooovian in there somewhere. R. Dean Stadem Consulting Engineer Analog Technologies Corp./Lumagine, Inc. 11441 Rupp Drive Burnsville, MN 55431 (952)894-9228 [log in to unmask] -----Original Message----- From: Inge [mailto:[log in to unmask]] Sent: Thursday, September 03, 2009 3:05 PM To: Dean Stadem; [log in to unmask] Subject: Re: [TN] BGA Pb-free, this is what I feared: Tin whiskers So TN have two Stadems. Inge ----- Original Message ----- From: "Dean Stadem" <[log in to unmask]> To: <[log in to unmask]> Sent: Thursday, September 03, 2009 9:55 PM Subject: Re: [TN] BGA Pb-free, this is what I feared: Tin whiskers >I would not send them to the PA immigrant, they might get stolen! > Just kidding, Steve. Any more developments on that? > > R. Dean Stadem > Consulting Engineer > Analog Technologies Corp./Lumagine, Inc. > 11441 Rupp Drive > Burnsville, MN 55431 > (952)894-9228 > [log in to unmask] > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge > Sent: Thursday, September 03, 2009 2:16 PM > To: [log in to unmask] > Subject: [TN] BGA Pb-free, this is what I feared: Tin whiskers > > We have HASL and via-in-pad. Electrical issues, disturbed signals. There > were hundreds of Tin whiskers on inside of the unfilled vias, and even > whiskers from solder pads circumperiphery, pointing at the nearby solder > pads. I suspect that the signal failures are caused by CAFs. Have any of > you > seen a connection between the presence of Tin whiskers and CAF growth? > > All BGA via-in-pads are solder mask defined. If you want photos, I can > send > a couple to the PA immigrant. > > /Inge > > --------------------------------------------------- > 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 > ----------------------------------------------------- > > --------------------------------------------------- > 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 > ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------