Hi Allen-

I was taught that too. Like a lot of things I was taught, I don't always do
that anymore.

I understand it to be strictly an issue with re-work. It's hard to
DE-solder an SMT pad in a big copper area. But sometimes it's better
electrically to bury an SMT pad. Some folks theoretically do not allow
re-work anyway, so....

Best Regards,
-Chris (el CID)




                       "Allen T. Maddox"
                       <allen.t.maddox@GAI-TRONIC        To:   [log in to unmask]
                       S.COM>                            cc:
                       Sent by: DesignerCouncil          Subject:    [DC] Trace width ratio to
                       <[log in to unmask]>           pad

                       07/27/2005 02:47 PM
                       Please respond to
                       "(Designers Council
                       Forum)"; Please respond to
                       "Allen T. Maddox"







Hey Folks,

I was always told to NOT exit a pad, especially a SMT pad, with a trace the
same width of the pad for the reason of dissipating the heat off the pad
and creating soldering issues.
I have an engineer who doesn't believe me and wants proof. Does anyone have
any articles that support what I've been taught, or have I been mislead all
these years?

Thanks,


Allen Maddox C.I.D.
Sr. PC Board Designer
GAI-Tronics, Corp
610-796-5854
PO Box 1060
Reading, PA 19607-1060

[log in to unmask]
www.gai-tronics.com


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