PCB Libraries Forum : Transistor familiy for DFN 3 Pin? https://www.PCBLibraries.com/forum/ Mon, 06 Apr 2026 20:54:57 +0000 Mon, 11 Mar 2013 18:01:59 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=881 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Transistor familiy for DFN 3 Pin? : PCB Footprint Expert strictly...]]> https://www.PCBLibraries.com/forum/transistor-familiy-for-dfn-3-pin_topic881_post3202.html#3202 Author: Tom H
Subject: 881
Posted: 11 Mar 2013 at 6:01pm

PCB Footprint Expert strictly follows JEDEC dimensioning practices (just like most component manufacturer's also use JEDEC dimensions).
 
]]> Mon, 11 Mar 2013 18:01:59 +0000 https://www.PCBLibraries.com/forum/transistor-familiy-for-dfn-3-pin_topic881_post3202.html#3202 <![CDATA[Transistor familiy for DFN 3 Pin? : Thank you for explaining the convention....]]> https://www.PCBLibraries.com/forum/transistor-familiy-for-dfn-3-pin_topic881_post3199.html#3199 Author: jsutin
Subject: 881
Posted: 11 Mar 2013 at 2:54pm

Thank you for explaining the convention.  In general, is there a push to standardize dimension nomenclature? Often, it seems manufacturers and cad software use completely different dimension names, even for fully defined JEDEC types.  It's a very minor hassle, but everything would be smoother if datasheets and calculators would agree. Does FPE follow any standards in this regard?


]]> Mon, 11 Mar 2013 14:54:09 +0000 https://www.PCBLibraries.com/forum/transistor-familiy-for-dfn-3-pin_topic881_post3199.html#3199 <![CDATA[Transistor familiy for DFN 3 Pin? : Thanks for the suggestion to...]]> https://www.PCBLibraries.com/forum/transistor-familiy-for-dfn-3-pin_topic881_post3198.html#3198 Author: Tom H
Subject: 881
Posted: 11 Mar 2013 at 11:49am

Thanks for the suggestion to add "Transistor" as a 3-pin DFN component family.
 
The "L" dimension is always the "Longest" dimension and the length of the Large Pin is rotated from the smaller pins. So L1 and b1 are correct.
 
]]> Mon, 11 Mar 2013 11:49:36 +0000 https://www.PCBLibraries.com/forum/transistor-familiy-for-dfn-3-pin_topic881_post3198.html#3198 <![CDATA[Transistor familiy for DFN 3 Pin? : Hi,I would suggest adding transistor...]]> https://www.PCBLibraries.com/forum/transistor-familiy-for-dfn-3-pin_topic881_post3197.html#3197 Author: jsutin
Subject: 881
Posted: 11 Mar 2013 at 11:29am

Hi,
 
I would suggest adding transistor as a family for DFN 3 pin components. 
 
Also, definitions for L1 and b1 seemed to be reversed, but this may be a judgement call especially since those dimensions entries do match the drawing below.
 
Thanks.
]]> Mon, 11 Mar 2013 11:29:39 +0000 https://www.PCBLibraries.com/forum/transistor-familiy-for-dfn-3-pin_topic881_post3197.html#3197