From my experience both thick and thin silver coating
Eddie



From my experience both thick and thin silver coatings normally work very well. Both, however, have from time to time experienced problems which in my opinion have not always been adequately explained. I would be hesitant to use a coating in a less than routine fashion; thin when it normally is thick. There are several  coatings that are normally applied a few micro inches thick. I would qualify any of these before going into production.



Best regards



Lee



J. Lee Parker, Ph.D.

JLP Consultants LLC

804 779 3389 

  ----- Original Message ----- 

  From: Eddie Rocha<mailto:[log in to unmask]> 

  To: [log in to unmask]<mailto:[log in to unmask]> 

  Sent: Wednesday, March 01, 2006 10:33 AM

  Subject: [TN] Thin vs thick silver





  I have some questions regarding immersion silver. IPC-4553

  standard refers to a thin and thick deposit silver as if

  there are two different type of silver formulations. I've

  spoken to multiple domestic chemical suppliers of the

  silver process and they all offer the thick deposit

  version. One supplier stated that they can provide a thin

  deposit with their thick deposit version with no

  solderability issues. The IPC standard states not to do

  this.



  Question 1: Why can't a thick deposit silver version be

  used to deposit a thin deposit (3-5 uin)?



  Question 2: Who supplies a thin deposit silver?



  Question 3: Would the thin silver deposit perform better

  than a thick deposit silver when press fitting pins?



  Thank you,

  Eddie Rocha



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