Has anyone seen any reliability data to show that Lead Free solders
would work better with rounded pads than with squared pads? This is not
to dispute Brian's contention (I actually agree with him). I was just
curious to see if any data supports this claim.

Lee Whiteman
Senior Manufacturing Engineer
American Competitiveness Institute
E-Mail: [log in to unmask]
Ph: (610) 362-1200 x208
Fax: (610) 362-1290

This message is for informational purposes only and does not supersede,
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian J. Toleno,
Ph.D.
Sent: Wednesday, March 24, 2004 1:29 PM
To: [log in to unmask]
Subject: Re: [TN] FW: Round SMT pads

Another reason for rounded pads is when using Pb-free solders, due to
the
increase in surface tension and wetting angle, people are moving to
rounded pads so that they don't have exposed corners after reflow.

Brian J. Toleno, Ph.D.
Sr. Applications Chemist
Loctite Electronics
15051 East Don Julian Rd
Industry, CA 91746
Ph: 626-968-6511 x304
Cell: 626-215-0879

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