Transistor familiy for DFN 3 Pin?

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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.

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jsutin Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 09 Mar 2013 Location: Boston Status: Offline Points: 15	Post Options Post Reply Quote jsutin Report Post Thanks(1) Quote Reply Topic: Transistor familiy for DFN 3 Pin? 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.



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5774	Post Options Post Reply Quote Tom H Report Post Thanks(1) Quote Reply 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.

jsutin Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 09 Mar 2013 Location: Boston Status: Offline Points: 15	Post Options Post Reply Quote jsutin Report Post Thanks(1) Quote Reply 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?

Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5774	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply 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).