Address,

     This is a two part question:

     1. DESIGNERS:      Are a majority of Designers designing boards with
                        the land width and lead width 1 to 1, on anything
                        less than a .020" pitch?

                        OR

                        Do you add 2 to 5 mils width to the land with
                        respect to the lead width?

     2. Manufacturing:  Does or has this posed as a problem with
                        reliability, solder volume on leads or the
                        achieving the proper solder fillet?

     My preference is to have the land 2 to 5 mils wider than the lead to
     allow for proper joint solderability.  The lead will also be 40/60 or
     30/70 centered with respect to the land length.  This allows proper
     solder forming to the toe and foot.  I see a lot of advantages to
     adding additional width to the lands where real estate allows.  So why
     do so many Designers opt for the 1:1 ratio, or am I generalizing?

     Please advise.

     John Gulley
     Inet Inc.
     1255 W. 15th
     Plano, TX 75075
     972-578-3928

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