PCB Libraries Forum : Square Masks on Round Pads https://www.PCBLibraries.com/forum/ Sat, 04 Apr 2026 11:32:37 +0000 Tue, 12 Nov 2013 09:47:16 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=1104 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Square Masks on Round Pads : Our Surface Mount SME also prefers...]]> https://www.PCBLibraries.com/forum/square-masks-on-round-pads_topic1104_post4614.html#4614 Author: caclark
Subject: 1104
Posted: 12 Nov 2013 at 9:47am

Our Surface Mount SME also prefers slightly over-sized square paste on round BGA pads (been doing it for several years to all BGA packages with a pitch of 50 or less). We have seen a dramatic improvement on stencil release and pad to ball adhesion during reflow.
]]> Tue, 12 Nov 2013 09:47:16 +0000 https://www.PCBLibraries.com/forum/square-masks-on-round-pads_topic1104_post4614.html#4614 <![CDATA[Square Masks on Round Pads : Hi Tom,Sorry for the slow response....]]> https://www.PCBLibraries.com/forum/square-masks-on-round-pads_topic1104_post4335.html#4335 Author: kwgilpin
Subject: 1104
Posted: 13 Sep 2013 at 1:37pm

Hi Tom,

Sorry for the slow response.  The part in question in STMicro BAL-NRF01D3:

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00055606.pdf

Thanks,
Kyle


]]> Fri, 13 Sep 2013 13:37:47 +0000 https://www.PCBLibraries.com/forum/square-masks-on-round-pads_topic1104_post4335.html#4335 <![CDATA[Square Masks on Round Pads : Our DFME suggest to set the solder...]]> https://www.PCBLibraries.com/forum/square-masks-on-round-pads_topic1104_post4323.html#4323 Author: Nightwish
Subject: 1104
Posted: 12 Sep 2013 at 1:05am

Our DFME suggest to set the solder paste to Round Rectangular shape instead of a round one. The picture below can show the padstack for BGA in our library. The blue round shape is pad and yellow one is solder mask. The Rnd Rec shape in green is solder paste.


]]> Thu, 12 Sep 2013 01:05:40 +0000 https://www.PCBLibraries.com/forum/square-masks-on-round-pads_topic1104_post4323.html#4323 <![CDATA[Square Masks on Round Pads : You can do this in FP Designer....]]> https://www.PCBLibraries.com/forum/square-masks-on-round-pads_topic1104_post4322.html#4322 Author: Tom H
Subject: 1104
Posted: 11 Sep 2013 at 7:41pm

You can do this in FP Designer.

Create your BGA in the Calculator and then convert it to FP Designer.

Then select the Pad Stack editor and change the Paste Mask from Round to square with rounded corners.
 
]]> Wed, 11 Sep 2013 19:41:35 +0000 https://www.PCBLibraries.com/forum/square-masks-on-round-pads_topic1104_post4322.html#4322 <![CDATA[Square Masks on Round Pads : Some BGA manufacturers call for...]]> https://www.PCBLibraries.com/forum/square-masks-on-round-pads_topic1104_post4317.html#4317 Author: kwgilpin
Subject: 1104
Posted: 10 Sep 2013 at 7:41pm

Some BGA manufacturers call for square solder and paste masks on top of round pads.  Can you make these independent options for both standard components and components created with FP Designer?

Thanks, as always,
Kyle
]]> Tue, 10 Sep 2013 19:41:52 +0000 https://www.PCBLibraries.com/forum/square-masks-on-round-pads_topic1104_post4317.html#4317