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Date:
Thu, 17 Aug 95 08:10:51 PST
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     Tom,
         We have been using "paste in hole" for soldering connector to the 
     "back" side of daughter boards. It took some time for us to develop 
     the process which included selecting the right solder paste, stencil 
     configuration, lead to hole ratios, and reflow profiles that would 
     give us acceptable results. We are using assembly/soldering pallets 
     with cavities that hold the connectors in position allowing us to 
     pre-load the connectors in the pallets and place the pasted PWB onto 
     the connector pins. The pallets hold multiple boards and they are used 
     in the pick and place machine as well as reflow. We are also using 
     "paste in hole" for soldering DIP relays and we're obtaining excellent 
     results. I caution you to look closely at the ability of your 
     components to withstand the reflow temperatures, as we had to change 
     our connectors to a higher temperature rated material.   
        There is a excellent article in the January issue of the SMT 
     Journal that was written by Bill Barthel. I recommend that you get a 
     copy as it does cover the subject well. 
        We are in the process of expanding this methodology to other PIH 
     components, and we're obtaining very encouraging results. 
        
         
        DAN BOTTS
        HUGHES TRAINING LINK DIVISION 
        [log in to unmask] 
        607-721-4565

______________________________ Reply Separator _________________________________
Subject: Paste in hole
Author:  [log in to unmask] at CCGATE
Date:    8/16/95 1:27 PM


Hi,
     
We are interested in assembly alternatives for components requiring wave 
soldering. The option of "paste in hole" was suggested. Does anyone have 
any experience in using "paste in hole" instead of conventional wave 
soldering for assembly of through hole components such as PGAs or 
connectors?  Any related information, e.g. published papers, reference, or 
standards for this manufacturing technique will help.  Thanks in advance.
     
Tom Chung
     
     

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