How can we know weather a Component ( for example MOSFET) need A Heat sink to Work properly.

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    \$\begingroup\$ We calculate it \$\endgroup\$
    – PlasmaHH
    Sep 26, 2015 at 20:16
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    \$\begingroup\$ mcmanis.com/chuck/robotics/projects/esc2/FET-power.html \$\endgroup\$
    – jippie
    Sep 26, 2015 at 20:17
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    \$\begingroup\$ Engineers posess the magical powers of doing calculations which they can use to answer such a question. \$\endgroup\$ Sep 26, 2015 at 20:48
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    \$\begingroup\$ I don't think this question deserves sarky answers. It's a big field but that's no reason folk should think it illegitimate to ask for an introduction to it. \$\endgroup\$
    – Dan
    Sep 26, 2015 at 21:29
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    \$\begingroup\$ Here is just one case where I've gone thru the calculations: electronics.stackexchange.com/q/92937/4512. \$\endgroup\$ Sep 26, 2015 at 21:42

1 Answer 1


We calculate the power dissipation, then look in the datasheet to see how hot the die without a heatsink, and compare that to the maximum operational die temperature. If the former exceeds the latter, then a heatsink is needed.

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    \$\begingroup\$ Actually, if the former is close to the latter a heat sink will probably save a lot of grief. \$\endgroup\$ Sep 26, 2015 at 22:59

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