DPAK with T-shaped Tab

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   I'm making footprints for some JEDEC TO-263 (D2PAK) packages. In a number of the variants, the thermal tab increases in width above the body of the part. 

My concern is that if I set E1 to the narrower dimension of the tab, it will solder okay, but the 3D model, courtyard, and outlines will be incorrect. 

If I set E1 to the widest extent of the pad, the pad will be swimming in solder and won't self center.

How have other people dealt with this? (I'm currently evaluating PCB Library Expert to see if it's better than the built in functionality of Altium.  

I'm hoping for a solution where standard packages don't require hand tweaks.)

--John

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ransonjd Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 15 Nov 2016 Status: Offline Points: 139	Post Options Post Reply Quote ransonjd Report Post Thanks(0) Quote Reply Topic: DPAK with T-shaped Tab Posted: 16 Dec 2016 at 7:23am
	I'm making footprints for some JEDEC TO-263 (D2PAK) packages. In a number of the variants, the thermal tab increases in width above the body of the part. My concern is that if I set E1 to the narrower dimension of the tab, it will solder okay, but the 3D model, courtyard, and outlines will be incorrect. If I set E1 to the widest extent of the pad, the pad will be swimming in solder and won't self center. How have other people dealt with this? (I'm currently evaluating PCB Library Expert to see if it's better than the built in functionality of Altium. I'm hoping for a solution where standard packages don't require hand tweaks.) --John



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: 5717	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 16 Dec 2016 at 7:28am
	All irregular shape pads are done internally at PCB Libraries in PADS Layout and then we add that data to this folder on your computer - C:\Program Files (x86)\PCB Libraries\Library Expert 2017\Libraries\PADS to CAD Watch this video of the Tool Box. You only need to watch the first minute. http://www.pcblibraries.com/products/fpx/userguide/default.asp?ch=12.1
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