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April 2009

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Subject:
From:
Ian Hanna <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ian Hanna <[log in to unmask]>
Date:
Thu, 16 Apr 2009 10:21:16 -0400
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text/plain (168 lines)
Isn't that just under the 4553 1.4.2 'Contact Surface' section?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Wednesday, April 15, 2009 5:34 PM
To: [log in to unmask]
Subject: Re: [TN] Gold/Tin Intermetallics, why are we afraid?

I am not the one to judge.  Ipc is the authority. 
--------------------------
Sent using BlackBerry


----- Original Message -----
From: Wenger, George M. <[log in to unmask]>
To: TechNet E-Mail Forum <[log in to unmask]>; Joyce Koo
Sent: Wed Apr 15 17:31:10 2009
Subject: RE: [TN] Gold/Tin Intermetallics, why are we afraid?


Joyce,

If ImAg is not recommended for IPC-6010 Class 3 what surface finishes
are?

Regards,
George
George M. Wenger
Andrew Wireless Solutions
Senior Principal FMA / Reliability Engineer
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 [Office]  (732) 309-8964 [Cell]
[log in to unmask]
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Wednesday, April 15, 2009 5:11 PM
To: [log in to unmask]
Subject: Re: [TN] Gold/Tin Intermetallics, why are we afraid?

"ImAG finishes have a 12-month shelf life in a controlled environment
(<35[degrees]C/<85[degrees] RH), which can be significantly shortened
when exposed to air pollution with high sulfur and chlorine content.
Silver embrittlement Embrittlement

A general set of phenomena whereby materials suffer a marked decrease in
their ability to deform (loss of ductility) or in their ability to
absorb energy during fracture (loss of toughness), with little change in
other mechanical properties, such  ([Ag.sub.3]Sn intermetallics) of
solder joints may occur when the finish thickness exceeds IPC-4553
recommendations and Pb-free, high silver content solders are used. ImAG
is not recommended for high-reliability assemblies that must meet
IPC-6010 Class 3 requirements, but is acceptable for Classes 1 and 2."

http://www.thefreelibrary.com/Will+discoloration+tarnish+ImAg+reliabilit
y%3F+Watch+for+silver...-a0193896272

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /*
Sent: Wednesday, April 15, 2009 4:34 PM
To: [log in to unmask]
Subject: Re: [TN] Gold/Tin Intermetallics, why are we afraid?


 Hi Vlad,
I cannot comment on your specific case, but look at the pics below to
see 
Ag-embrittlement.
Sorry 'Netters, IPC strips pics.

Werner

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