Ofer

Does the supplier have any evidence of this corrosion? Over the past 10 years I have seen many immersion silver boards with plugged vias  without any earmarks of corrosion.

Best regards

Lee
  ----- Original Message ----- 
  From: Ofer Cohen<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Monday, April 04, 2005 10:59 AM
  Subject: Re: [TN] Immersion Silver


  Fellows,

  I was just acknowledged by a PCB manufacturer that both ImAg and ImSn will be damaged if via holes are plugged (rather than tented). The ImAg will be corroded and the IMC layer of the ImSn will grow. As the plugging process (said he) is the very last process, both finishes will be Both will be polluted by the residues. His suggestion is to fill the vias before the external coating.

  Did anyone meet the described problems?

  Regards
  Ofer Cohen
  Manager
  Quality Assurance, Reliability and Production Technologies
  Seabridge Ltd. - A Siemens Company
  Siemens COM FN A SB TQM

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