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Transistor familiy for DFN 3 Pin?

Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=881
Printed Date: 22 Nov 2024 at 4:45pm


Topic: Transistor familiy for DFN 3 Pin?
Posted By: jsutin
Subject: Transistor familiy for DFN 3 Pin?
Date 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.


Replies:
Posted By: Tom H
Date 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.
 

Posted By: jsutin
Date 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?

Posted By: Tom H
Date 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).
 


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