PCB Libraries Forum : SOT-223 tab pad https://www.PCBLibraries.com/forum/ Mon, 06 Apr 2026 10:48:09 +0000 Mon, 07 Sep 2020 21:06:19 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=2671 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[SOT-223 tab pad : I know I can change it in the...]]> https://www.PCBLibraries.com/forum/sot223-tab-pad_topic2671_post10930.html#10930 Author: jhansonxi
Subject: 2671
Posted: 07 Sep 2020 at 9:06pm

I know I can change it in the preferences. 

I can also change it in Altium.  

But that doesn't answer my question: Why does the small pin dimensions affect the Tab Pad?
]]> Mon, 07 Sep 2020 21:06:19 +0000 https://www.PCBLibraries.com/forum/sot223-tab-pad_topic2671_post10930.html#10930 <![CDATA[SOT-223 tab pad : You are in 100% control of the...]]> https://www.PCBLibraries.com/forum/sot223-tab-pad_topic2671_post10928.html#10928 Author: Tom H
Subject: 2671
Posted: 06 Sep 2020 at 4:42pm

You are in 100% control of the Preference Options. 

If you are using Library Expert Pro, you can select the "Rules" tab and change the "Corner Radius Size" values to anything you want. There is: 
  • Corner Radius Size (% of Pad Width)
  • Corner Radius Size Limit
  • Corner Radius Round-off
Change the "Corner Radius Size Limit" to 0.10 and you'll tighten up your corner radius values. 

If you get the Free Library Expert Enterprise on a Cloud License you just pay for the yearly maintenance to get all the updates and technical support. 

Then you can have access to the Global Preferences so that you set the values once and it applies to every footprint. The Enterprise edition allows you access to over 1,000 preference settings to globally apply to every footprint. 

]]> Sun, 06 Sep 2020 16:42:45 +0000 https://www.PCBLibraries.com/forum/sot223-tab-pad_topic2671_post10928.html#10928 <![CDATA[SOT-223 tab pad : I&#039;m normalizing my SOT-223/TO-261...]]> https://www.PCBLibraries.com/forum/sot223-tab-pad_topic2671_post10926.html#10926 Author: jhansonxi
Subject: 2671
Posted: 06 Sep 2020 at 4:02pm

I'm normalizing my SOT-223/TO-261 FPs across multiple manufacturers.  The dimensions I'm using are identical across 4, 5, and 6 pin except for the pitch and pin widths.  I've noticed that with LEP 2019.07 the tab pad size changes along with its corner radii when the smaller pins on the other side change.  For example, the Y size on a 4-pin is 1.8mm but on a 5 or 6-pin it is 1.65mm.  Is this intentional?  What is the rationale?
]]> Sun, 06 Sep 2020 16:02:34 +0000 https://www.PCBLibraries.com/forum/sot223-tab-pad_topic2671_post10926.html#10926