Thank you Mike ---- On Thu, 10 Dec 2015 05:03:38 -0800 Mike Fenner wrote ---- >I have seen something similar before with Sn/Ag solders and also high leads, >both in die attach applications with longish reflow cycles. >Whether that's relevant or coincidence couldn't say. Thought it could beat >the time. >The Sn one may be the same as here. Then the analysis reported only Sn, but >the reporter may have dismissed any O (and C and H etc) as background from >laminate. I'm not sure the cause was ever identified but am sure it was a >long time ago. I will have to go back through some archived stuff and hope I >can find something. > >-- >Regards > >Mike > >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev >Sent: Thursday, December 10, 2015 12:53 AM >To: [log in to unmask] >Subject: Re: [TN] What else it can be > >It varies > >---- On Wed, 09 Dec 2015 16:44:26 -0800 Yuan-chia Joyce Koo wrote ---- >>where is the origin of the pwa? (country of origin). >>On Dec 9, 2015, at 7:03 PM, Vladimir Igoshev wrote: >> >>> Hi Dave, >>> >>> Not really. It doesn't "burn" or "curl" much under the beam, so >>> it's solid. >>> >>> Vladimir >>> >>> ---- On Wed, 09 Dec 2015 15:51:29 -0800 David >>> Hillman<[log in to unmask]> wrote ---- >>>> Thank you Steve! >>>> >>>> Vlad - does the substance slightly charge in the SEM? >>>> >>>> Dave >>>> >>>> On Wed, Dec 9, 2015 at 5:46 PM, Steve Gregory <[log in to unmask]> >>>> wrote: >>>> >>>>> Hi Dave and Vlad, >>>>> >>>>> I have it up here: >>>>> >>>>> http://stevezeva.homestead.com/What_else_it_can_be.pdf >>>>> >>>>> Steve >>>>> >>>>> On Wed, Dec 9, 2015 at 4:34 PM, David Hillman < >>>>> [log in to unmask]> wrote: >>>>> >>>>>> HI Vlad - we can't open Dropbox here due to firewall >>>>>> restrictions so can >>>>>> you have Steve G. post the pictures? >>>>>> >>>>>> Dave Hillman >>>>>> Rockwell Collins >>>>>> [log in to unmask] >>>>>> >>>>>> On Wed, Dec 9, 2015 at 4:59 PM, Vladimir Igoshev < >>>>>> [log in to unmask] >>>>>>> wrote: >>>>>> >>>>>>> HI everyone, >>>>>>> >>>>>>> I'm attaching a link to a file showing something I'd appreciate >>>>>>> your >>>>>>> thoughts on. It's a cross-section of a QFN on an IAg board; >>>>>>> Pb-free/no-clean process. As you can see from the EDS spectrum, >>>>>>> that >>>>>>> greyish stuff between pins has pretty much only Sn and O in its >>>>>> elemental >>>>>>> composition. >>>>>>> >>>>>>> I know there is burn flux residue around solder joints but that >>>>>>> stuff >>>>>>> doesn't have any C in it. The question I have is what is it. >>>>>>> >>>>>>> I spoke to Bev and both of us are still puzzled. >>>>>>> >>>>>>> Here is the link: >>>>>>> >>>>>> https://www.dropbox.com/s/3wbj62vqjyhvj2y/What%20else%20it%20can% >>>>>> 20be.pdf?dl=0 >>>>>>> >>>>>>> Thank you very much in advance. >>>>>>> >>>>>>> Regards, >>>>>>> >>>>>>> Vladimir >>>>>>> >>>>>>> SENTEC >>>>>>> >>>>>>> >>>>>>> __________________________________________________________________ >>>>>>> ____ >>>>>>> This email has been scanned by the Symantec Email Security.cloud >>>>>> service. >>>>>>> For more information please contact helpdesk at x2960 or >>>>>> [log in to unmask] >>>>>>> __________________________________________________________________ >>>>>>> ____ >>>>>>> >>>>>> >>>>>> >>>>>> ___________________________________________________________________ >>>>>> ___ >>>>>> This email has been scanned by the Symantec Email Security.cloud >>>>>> service. >>>>>> For more information please contact helpdesk at x2960 or >>>>>> [log in to unmask] >>>>>> ___________________________________________________________________ >>>>>> ___ >>>>>> >>>>> >>>>> >>>>> >>>>> This email and any attachments are only for use by the intended >>>>> recipient(s) and may contain legally privileged, confidential, >>>>> proprietary >>>>> or otherwise private information. 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