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June 2013

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Subject:
From:
Dee Stover <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dee Stover <[log in to unmask]>
Date:
Thu, 27 Jun 2013 10:38:52 -0700
Content-Type:
text/plain
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text/plain (71 lines)
Thank you George!

At 10:13 AM 6/27/2013, you wrote:
>Dee,
>
>If you are asking about Immersion Silver the IPC specification is 
>IPC_4553 and it calls out 0.12um (5u") minimum and 0.4um (16u") maximum.
>
>We've used immersion silver for over 13 years and our internal 
>specification back in the 1990's when AlphaLevel was the only 
>immersion silver commercially available was 2 to 10 
>micro-inches.  When other vendors introduced their immersion silver 
>chemistry we changed our specification to 2 to 20 micro-inches.  We 
>use the 2 to 20 micro-inch as a typical range rather than as an 
>absolute minimum and maximum.  Although we've almost never have 
>received PCBs with less than 2 micro-inches of immersion silver 
>there have been many occasions where we've received PCBs where the 
>immersion silver on very small features has been 23 to 26 
>micro-inches thick.  We've never any issues with the 23 to 26 
>micro-inch thickness and we don't typically reject PCBs unless the 
>silver is over 30 micro-inches.
>
>Regards,
>George
>George M. Wenger
>Failure Signature & Characterization Lab LLC
>609 Cokesbury Road, High Bridge, NJ 08829
>(908) 638-8771 Home (732) 309-8964 Mobile
>E-mail: [log in to unmask]
>[log in to unmask]
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Dee Stover
>Sent: Thursday, June 27, 2013 12:56 PM
>To: [log in to unmask]
>Subject: [TN] spec for silver finish on pcb
>
>I have only specified ENIG in the past, this next job is silver 
>plating. I don't have the correct IPC to specify this on my fab drawing.
>Can someone please share the proper note for silver finish including 
>any  necessary diffusion barrier.
>
>Thanks,
>
>:-) Dee Stover  [log in to unmask]   520-318-8489
>CAD Design Lead
>National Optical Astronomy Observatories www.noao.edu
>
>
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:-) Dee Stover  [log in to unmask]   520-318-8489
CAD Design Lead
National Optical Astronomy Observatories
www.noao.edu 


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