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November 2011

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Subject:
Re: Strange Gold?
From:
"Wenger, George M." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wenger, George M.
Date:
Thu, 17 Nov 2011 14:22:32 -0600
Content-Type:
text/plain
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text/plain (70 lines) 
Steve,

Two questions:
1. What is the surface finish on the SON8?
2. Did you see this discoloration on any other device footprints?

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


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Thursday, November 17, 2011 1:59 PM
To: [log in to unmask]
Subject: [TN] Strange Gold?

Hi All,

 

Below is a photo of a SON8 footprint that was printed with SAC305 on a gold
plated PCB and reflowed. I have never seen this before. Is this "purple
plague"? If it is, exactly what causes it?

 

http://stevezeva.homestead.com/Strange_Gold.jpg

 

Steve



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