PCB Libraries Forum : Rounded Rectangle Pad Shape For SON & QFN https://www.PCBLibraries.com/forum/ Fri, 26 Jun 2026 15:17:57 +0000 Fri, 16 Nov 2012 14:28:40 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=617 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Rounded Rectangle Pad Shape For SON & QFN : We added Rounded Rectangular...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2357.html#2357 Author: Tom H
Subject: 617
Posted: 16 Nov 2012 at 2:28pm

We added Rounded Rectangular pad shape to SOD and TO (DPAK) in V31 coming out this weekend.
 
]]> Fri, 16 Nov 2012 14:28:40 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2357.html#2357 <![CDATA[Rounded Rectangle Pad Shape For SON & QFN : I think that once you intruduce...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2337.html#2337 Author: Tom H
Subject: 617
Posted: 14 Nov 2012 at 5:23pm

I think that once you intruduce Rounded Rectangle pad shape for all Surface Mount patterns (except Grid Array) then that should improve fabrication, stencil paste application, assembly reflow and inspection. 
 

I believe Rounded Rectangle pad shape is the future for several reasons, but the top is "all stencil apertures are created using laser technology and that produces a corner radius on the SMT aperture openings. So why not make the pad shape match the stencil.
 
Here are lead and lead free solder after reflow. There is no solder in the pad corners. Wouldn't it be best to shape the pad to the solder flow?

 


 

]]> Wed, 14 Nov 2012 17:23:54 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2337.html#2337 <![CDATA[Rounded Rectangle Pad Shape For SON & QFN : Are people liking rounded...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2336.html#2336 Author: DaveCowl
Subject: 617
Posted: 14 Nov 2012 at 3:35pm


Are people liking rounded rectangle for chip components (like 0402, etc.) or are they more of a leaded component thing?
]]> Wed, 14 Nov 2012 15:35:53 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2336.html#2336 <![CDATA[Rounded Rectangle Pad Shape For SON & QFN : Rounded Rectangle pad shape...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2334.html#2334 Author: Tom H
Subject: 617
Posted: 14 Nov 2012 at 10:53am

Rounded Rectangle pad shape will be available in every SMT component family except Grid Array packages. This is a new feature that is planned to be implemented this year.
 
It includes QFN, SON, PQFN and PSON component families too.
 
]]> Wed, 14 Nov 2012 10:53:26 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2334.html#2334 <![CDATA[Rounded Rectangle Pad Shape For SON & QFN : Is there a reason rounded rectangle...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2333.html#2333 Author: plinder
Subject: 617
Posted: 14 Nov 2012 at 9:44am

Is there a reason rounded rectangle pad shapes are also not available for SOD, TO, SOFL - or will those be added in the future as well?

]]> Wed, 14 Nov 2012 09:44:59 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2333.html#2333 <![CDATA[Rounded Rectangle Pad Shape For SON & QFN : There are only 2 SON/QFN...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2116.html#2116 Author: Tom H
Subject: 617
Posted: 23 Oct 2012 at 7:42pm

There are only 2 SON/QFN component lead shapes - D-Shape & Rectangle
 
However, that makes no difference to your question. We'll add Rounded Rectangle pad shape option to SON/QFN packages in an upcoming release (soon).
 
]]> Tue, 23 Oct 2012 19:42:24 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2116.html#2116 <![CDATA[Rounded Rectangle Pad Shape For SON & QFN : Is there a reason rounded rectangle...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2028.html#2028 Author: chads108
Subject: 617
Posted: 18 Oct 2012 at 1:05pm

Is there a reason rounded rectangle pads are not an option for SON/QFN packages?]]> Thu, 18 Oct 2012 13:05:59 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-pad-shape-for-son-qfn_topic617_post2028.html#2028