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June 1997

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Subject:
Re: Tented Via Reliability -Reply
From:
[log in to unmask] (Frank Hinojos)
Date:
Tue, 10 Jun 1997 17:40:39 -0700
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     I was not aware that LPI itself could pose a contamination problem.  
     What can the LPI process trap that would be damaging to the via?  I am 
     worried about the fluxes and all other contaminants that the "trash 
     can" effect can catch during the product's life.
     
     Frank Hinojos
     Watkins-Johnson Co.


______________________________ Reply Separator _________________________________
Subject: Tented Via Reliability -Reply
Author:  bob metcalf <[log in to unmask]> at INTERNET
Date:    6/10/97 5:16 PM


True tented vias can only be achieved using dry film solder mask. Many 
people us liquid photoimageable solder mask to "plug" vias. This is fairly 
effective but not as reliable as dry film. The liquid method can lead to 
entrapment of contaminants as well as not form a 100% reliable plug. 
Plugging with a liquid is dependent on both the solder mask and the skill 
of the people applying the mask.
     
Bob Metcalf
Morton Electronic Materials
     
>>> Frank Hinojos <[log in to unmask]> 06/10/97 04:18pm >>>
     I would like to use tented vias in my designs for the assembly 
     advantages but have heard that the tented via can then act like a 
     trash can which collects contaminants and therefore may cause 
     reliability problems.  Is this rumor founded?  Are there studies?
     
     Frank Hinojos
     Watkins-Johnson Co.
     
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