Overprinting will cause solderballs. You can print with a 1 mil reduction (or even 1:1) with the 0402 pad as that will maximize solder between the contact area. 


Amol Kane | Process Engineer
Catalyst Manufacturing Services, Inc.
941 Route 38, Owego NY 13827
Phone: (607) 687-7669 Extn 349 | Website: www.catalystems.com


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Karen Tellefsen
Sent: Monday, August 01, 2011 11:49 AM
To: [log in to unmask]
Subject: [TN] 0603 on 0402 pads

Has anyone placed 0603 passives on 0402 pads?  There isn't much overlap,
and I'd expect placement would be critical.  Does one need to overprint the
paste?

Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069



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