Comments to the attached note:                                                  

Electrolytic plating requires the application of external current to            
the part, while electroless plating doesn't (the chemistry is such that         
it will plate on a catalytic surface).                                          

So, electroless plating becomes interesting when there is a push toward         
higher performance or miniaturization because, in addition of saving            
real estate on the card by not having commoning bars, less noise will           
be introduced in the systtem at higher frequency because of such                
unwanted metallurgy. With electroless plating to be used as the surface         
finish method, the laminate doesn't need to be designned with this              
additional concern of being able to carry the current to all features.          

Richard Langlois                                                                
IBM Canada in Bromont                                                           
email: [log in to unmask]                                                   

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 Date: Mon, 15 Jul 1996 11:21:53 -0500                                          
 To: [log in to unmask]                                                            
 From: [log in to unmask] (Zoila Vega-Marchena)                  
 Subject: FAB:electroless nickel-Immersion Gold                                 
 Resent-Message-ID: <"eDIVa2.0.8-C.ducwn"@ipc>                                  
 Resent-From: [log in to unmask]                                                   
 X-Mailing-List: <[log in to unmask]> archive/latest/5203                          
 X-Loop: [log in to unmask]                                                        
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 In the Electroless Nickel-Immersion Gold process, why is the Nickel            
 electroless (as opposed to electrolytic)?                                      

 Thanks for the information!                                                    
 Zoila Vega                                                                     


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