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TO with T shaped Tab

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DaveCowl View Drop Down
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    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.


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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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post 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.
 
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