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Date: Sun, 21 Jul 2013 10:27:14 -0400 (EDT)
From: Stuart Brorson <sdb AT cloud9 DOT net>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] H-bridge footprint help
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There are a couple of things you can do.

1.  Since the output is on both pin 4 and pin 8 (the tab), you can
stand the part upright, with the tab in the air, and take the output
from only pin 4.  You should probably also put a heatsink on the tab.
Figure out how much power the part will dissipate, and choose a
heatsink which will dissipate the power.  Here's a list:

http://www.digikey.com/product-search/en/fans-thermal-management/thermal-heat-sinks/1179752?k=heatsink%20%20TO-220

2.  You can lay the part down on the board, and solder the tab onto a
big metal plane.  The plane will act as a heat sink and you can also
route to it (i.e. connect to both the tab and to pin 4).

Which one you want to do will be largely determined by how much power
the part will dissipate.

I did a quick Google search on "mount TO-220 pakage" and a bunch of
interesting references popped up.  Here's one:

http://www.aosmd.com/res/application_notes/package/AN101_TO220_Guidelines.pdf

Many others were also listed in the search results, so I suggest you
do a search.

HTH,

Stuart





On Sun, 21 Jul 2013, Rob Butts wrote:

> I'm using an h-bridge in a design and I'm a bit confused on the footprint.
> It is a TO220-7 thruhole component.  The top big square pad is an output
> pin but it appears to stand off the board.  There isn't a suggested
> footprint in the documentation.
>
> The digikey part number is: BTN7960P-ND and the document is attached.
>
> How does pin 8 get connected to?
>
> Thanks
>
> BTN7960-47A-Half-Bridge.pdf<https://docs.google.com/file/d/0ByNkqE4yaJCVVHZJNE9vRVB3Q2c/edit?usp=drive_web>
>
>