I'll take a stab at answering the two questions you raise
Wayne,
I'll take a stab at answering the two questions you raised and also
correct one of the statements you made.
You indicated incorrectly that you "know that UL recently
"de-criminalized" ImAg, primarily based on IPC pressure." The IPC
didn't pressure UL to "de-criminalize" immersion silver. IPC member
companies who had experience with immersion silver surface finish on
PCBs jointed the IPC 3-11g sub-committee along with UL participation and
generated data that resulted in UL update the testing requirements that
were being imposed on silver finishes. IPC and UL are organizations
that make specification changes based on data not pressure.
As for why iNEMI hasn't "de-criminalized" there was no reason for them
to "de-criminalize" immersion silver because they had never
"criminalized" it. If you look at the title of the paper written by the
iNEMI Tin Whisker User Group it covers "iNEMI Recommendations on
Lead-Free Finishes for Components Used in High-Reliability Products".
This group concentrated on component finishes not board finishes. In
particular, if you look at Table 5 in their report that summarizes the
assessments of the individual members of the iNEMI Users Group relative
to PCB finishes you will see that there are no tin whisker test
requirements for immersion silver.
As for papers on the electro-migration severity of immersion silver I
would start on the UL PCB site:
http://www.ul.com/pwb/silver.html
and then review the IPC 3-11g committee work.
Regards,
George
George M. Wenger
Andrew Corporation Wireless Network Solutions
Senior Principal FMA / Reliability Engineer
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 [Office] (732) 309-8964 [Cell]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
Sent: Monday, December 18, 2006 3:48 PM
To: [log in to unmask]
Subject: Re: [TN] iNEMI Hi rel Pb-free finish report
Sorry. Here you go:
http://thor.inemi.org/webdownload/projects/ese/tin_whiskers/Pb-Free_Fini
shes_v4.pdf
Wayne
>>> [log in to unmask] 12/18/2006 2:57:21 pm >>>
Is the iNEMI 12/1/06 Pb-Free finish report published some
Wayne,
Is the iNEMI 12/1/06 Pb-Free finish report published somewhere?
Regards,
George
George M. Wenger
Senior Principle FMA / Reliability Engineer
Wireless network Solutions
Andrew Corporation, 40 Technology Drive, Warren, NJ 07059 (908)
546-4531
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
Sent: Monday, December 18, 2006 2:50 PM
To: [log in to unmask]
Subject: [TN] iNEMI Hi rel Pb-free finish report
In this report (dated 12/1/06) there are several cautions about
Immersion Ag due to electro-migration issues, particularly in
sulfurous
environments.
I know that UL recently "de-criminalized" ImAg, primarily based on IPC
pressure. Why hasn't iNEMI?
Can anybody recommend a paper which explains the severity of this
electro-migration issue with respect to ImAg?
Thanks,
Wayne Thayer
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