PCB Libraries Forum : TO with T shaped Tab https://www.PCBLibraries.com/forum/ Thu, 16 Apr 2026 04:50:56 +0000 Tue, 30 Oct 2012 18:16:35 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=649 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[TO with T shaped Tab : Youuse the mfr. recommended...]]> https://www.PCBLibraries.com/forum/to-with-t-shaped-tab_topic649_post2229.html#2229 Author: Tom H
Subject: 649
Posted: 30 Oct 2012 at 6:16pm

You use the mfr. recommended pattern for your pad shape. National Semi is calling it a "Lead Position Overlay".
 
You may have to tinker with the thermal tab size to auto-generate a close match to the recommended thermal pad pattern size.
 
]]> Tue, 30 Oct 2012 18:16:35 +0000 https://www.PCBLibraries.com/forum/to-with-t-shaped-tab_topic649_post2229.html#2229 <![CDATA[TO with T shaped Tab : I hope this is the right place...]]> https://www.PCBLibraries.com/forum/to-with-t-shaped-tab_topic649_post2226.html#2226 Author: DaveCowl
Subject: 649
Posted: 30 Oct 2012 at 6:05pm


I hope this is the right place to ask this... feel free to move it if it is not.

What should I do with a TO surface mount part that has a T shaped tab.

This is the example I am looking at: http://www.datasheetcatalog.org/datasheet/nationalsemiconductor/PD070096.PDF

Here the top of the tab is full width but the majority of it is not.

The Calculator appears to assume a uniform width, but when the tab is not a rectangle, what width is best to use to base the footprint on?
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