I think Dave was correct about the question marks a
Joyce,
I think Dave was correct about the question marks after "Authority" in
his email. Remember he's the lowly engineer fighting off the
alligators, trying to figure out how to convert from microns to inches
while he's looking for the light at the end of the tunnel.
Sorry Dave. You do know I don't believe what I wrote above but I
couldn't pass up the opportunity.
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 David D. Hillman
Sent: Thursday, April 16, 2009 3:53 PM
To: [log in to unmask]
Subject: Re: [TN] NTC - [TN] Gold/Tin Intermetallics, why are we afraid?
Hi Joyce! Authority??????? I am just a lowly engineer trying to find the
light at the end of the tunnel without having all the alligators in the
swamp get me first. My luck will be that the light at the end of the
tunnel is Doug driving a train!
Dave
Joyce Koo <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
04/16/2009 02:48 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Joyce Koo <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] Gold/Tin Intermetallics, why are we afraid?
Ha, the authority is spoken!
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: April 16, 2009 3:32 PM
To: [log in to unmask]
Subject: Re: [TN] Gold/Tin Intermetallics, why are we afraid?
Hi Joyce - my response would "it depends" (and Doug gets another Diet
Mt.
Dew) as Rockwell Collins utilizes immersion silver pwb surface finishes
on
many IPC Class 3 type products with no reliability issues.
Dave
Joyce Koo <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
04/15/2009 04:11 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Joyce Koo <[log in to unmask]>
To
[log in to unmask]
cc
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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