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.

  • 3
    \$\begingroup\$ It's gate, not grid. Grids are for valves. \$\endgroup\$ – Federico Russo Nov 18 '11 at 12:41
  • 15
    \$\begingroup\$ Time to discover datasheets \$\endgroup\$ – stevenvh Nov 18 '11 at 12:52

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.

  • 1
    \$\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
  • 4
    \$\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
  • 5
    \$\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
  • 5
    \$\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
  • 1
    \$\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


See page 8.


protected by Dave Tweed Jul 24 '14 at 18:14

Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).

Would you like to answer one of these unanswered questions instead?

Not the answer you're looking for? Browse other questions tagged or ask your own question.