FROM: BRUCE HOUGHTON  27/552/844/TOR                                           
*** Resending note of 05/11/95 11:12                                           
Phone  (416) 448-5701     Tie 778-5701                                         
Subject: Tin/lead plating vs HAL                                               
Doug,                                                                          
Tin/lead plated (and reflowed) tabs over nickel will give a very               
consistent and controlled thickness of solder over the tabs.                   
HASL is difficult to control for both thickness and uniformity.                
Tin/lead plate and reflow tabs may cost a little more.                         
                                                                               
Bruce Houghton                                                                 
Celestica, Inc                                                                 
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> Date: Thu, 11 May 1995 06:47:38 EDT                                          
> From: [log in to unmask] (MR DOUGLAS C JEFFERY)                             
                                                                               
-- [ From: Douglas C. Jeffery * EMC.Ver #2.10P ] --                            
                                                                               
                                                                               
I recently had a customer inquire about the advantages or disadvantages        
of using tin/lead plating over HAL for a connector application (SIMMs).        
We have been 100% HAL for several years and I couldn't really answer           
his question other than to say we don't have a tin/lead bath...So..Are         
there any thoughts as to one method being preferred over the other?            
(note. the question is about the insertion tabs not component                  
attachment, and he currently is not using ni/au).                              
                                                                               
Thanks for any insight.                                                        
                                                                               
Doug Jeffery                                                                   
Electrotek, Inc.                                                               
[log in to unmask]                                                            
414-762-1390