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TO-220 Package Footprint name

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Bharat_Verma View Drop Down
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    Posted: 01 Jun 2021 at 9:42pm
Hi Tom,
I have a Question regarding Footprint name for flange mount TO-220 VERTICAL .

There are two different style or pattern of lead location for which Footprint name remain same.

See attached example. Why it was not differentiated ?




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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: 02 Jun 2021 at 7:41am
Because IPC did not provide any land pattern naming convention guidance for Vertical or Horizontal Flange Mount component family. 

I guess we could create our own since IPC did not address this in the IPC-7351 guideline. 

What would you propose? 

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Post Options Post Options   Thanks (1) Thanks(1)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2021 at 11:34am
The only reason to spread the pins out is because the pin pitch is too small and the pad size too large and they short together. 

The Footprint Name includes the pin pitch. 

Ideally you want all the pads in a single row, but if the pads short together then you must bend the terminal leads to separate the pads so they do not short. 

The footprint name doesn't change because you only have 2 options. 

Pads in a row or staggered pads if the pin pitch is too tight. 

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