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I have an IRF3205 MOSFET in a TO-220 package, and I would like to know where the drain, gate and source are. I can't find this information.

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    \$\begingroup\$ It's gate, not grid. Grids are for valves. \$\endgroup\$ – Federico Russo Nov 18 '11 at 12:41
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    \$\begingroup\$ Time to discover datasheets \$\endgroup\$ – stevenvh Nov 18 '11 at 12:52
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The information is available in the datasheet as you might expect (fourth hit on google).

Here is the relevant bit (page 8 of the datasheet):

enter image description here

So Gate, Drain, Source, and Drain on the tab.

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    \$\begingroup\$ Sorry, I had the datasheet but didn't find the information. Even with your picture, I couldn't find the pin assignments right away. (They're on the right for those dumb like me) \$\endgroup\$ – Mildred Nov 18 '11 at 12:53
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    \$\begingroup\$ I agree, it's not a good layout and I always have to look twice to find it. Once you know though it's easy to spot. \$\endgroup\$ – Majenko Nov 18 '11 at 13:21
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    \$\begingroup\$ For you datasheet writers: Best is to put the pin assignment diagram on the first page, and to make it 3D for parts like these. Sometimes I wonder if a 2D drawing is from above or below (or even front/back if the front side is not so well defined). \$\endgroup\$ – starblue Nov 19 '11 at 8:49
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    \$\begingroup\$ @starblue - everybody wants to have the for him relevant information on the first page. Maybe we should have datasheets with only a page 1. Size should be A\$_{-2}\$, of course. \$\endgroup\$ – stevenvh Jul 28 '12 at 13:54
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    \$\begingroup\$ Meh, every other semiconductor company puts the pinout on one of the first three pages, often depending on the number of packages and the pin count. I never understood why IRF and maybe a handful others put their pinouts at the end in the middle of some package drawings you normally never bother looking at. \$\endgroup\$ – dom0 May 9 '13 at 15:15
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http://www.irf.com/product-info/datasheets/data/irf3205.pdf

See page 8.

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