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 > > >______________________________________________________________________ >This email has been scanned by the Symantec Email Security.cloud service. >For more information please contact helpdesk at x2960 or >[log in to unmask] >______________________________________________________________________ > >______________________________________________________________________ >This email has been scanned by the Symantec Email Security.cloud service. >For more information please contact helpdesk at x2960 or [log in to unmask] >______________________________________________________________________ :-) Dee Stover [log in to unmask] 520-318-8489 CAD Design Lead National Optical Astronomy Observatories www.noao.edu ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________