Ha, you got one of boards has fur coat? Hehehe. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Sent: Thursday, September 03, 2009 3:37 PM To: [log in to unmask] Subject: Re: [TN] BGA Pb-free, this is what I feared: Tin whiskers It's believed to be Tin/Bismuth directly on Copper (beware) and a extraordinary thick solder mask. I'll take a closer look 2morrO. Inge ----- Original Message ----- From: "David D. Hillman" <[log in to unmask]> To: <[log in to unmask]> Sent: Thursday, September 03, 2009 9:24 PM Subject: Re: [TN] BGA Pb-free, this is what I feared: Tin whiskers > Hi Inge - what is the pwb finish? > > Dave Hillman > Rockwell Collins > [log in to unmask] > > > > Inge <[log in to unmask]> > Sent by: TechNet <[log in to unmask]> > 09/03/2009 02:15 PM > Please respond to > TechNet E-Mail Forum <[log in to unmask]>; Please respond to > Inge <[log in to unmask]> > > > To > [log in to unmask] > cc > > 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 ----------------------------------------------------- --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. 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