Bob,

Try taking a look at PCD mag a couple of months back.

There was a good article on improved CPk due to percentage of rounding.

Off the top of my useless brain I think it was like 30% but You should look to verify.

Good luck,

FNK



Frank N Kimmey CID+

Electrical Engineer / PCB Design

VeriFone Inc

1400 W Stanford Ranch Road, Suite 200

Rocklin, CA 95765 USA

W: 1-916-625-1818

M: 1-916-833-9877

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-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Cochran

Sent: Wednesday, September 06, 2017 1:23 PM

To: [log in to unmask]

Subject: [TN] rounded SMT pads...



Hello,



Assuming it exists, where can I find the latest and greatest IPC recommendation for SMT rounded pad shapes?  I'm hoping that such a recommendation exists as a rule for SMT pads and that every particular package doesn't have its own recommendation.



BTW, I'm familiar with the radius definition provided here by Wolfram:

http://mathworld.wolfram.com/RoundedRectangle.html



However, my Altium tool requires me to specify it in terms of a percentage ( half of the

         shortest side of the pad ).



I'm hoping it's specified in one of these two forms.



Thank you,



Bob



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