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Heatsink for KA7805?

Discussion in 'General Electronics Discussion' started by bigone5500, Aug 13, 2016.

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  1. bigone5500

    bigone5500

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    Apr 9, 2014
    I have done some research and have come to the conclusion that the above regulator does not need a heat sink when used on a breadboard arduino.

    Is this a true or false statement?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    It all depends on the current and voltage differential. But practically speaking, if it doesn't get hot you're OK to go.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    @Two Volt, your answer ignores the voltage differential. Try it with a 20V differential :-D
     
  4. bigone5500

    bigone5500

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    Apr 9, 2014
    The reason I am concerned a bit is my UNO boards and my megas have the AMS1117 regulator and they don't have a heat sink. However, when running a sketch with my led cube, the regulator gets pretty hot. I have been running my UNO with the sketch for a few days now and it hasn't shut down. This is with a 12v input.
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    If you can run it with a lower input voltage the regulator won't get as hot.
     
  6. bigone5500

    bigone5500

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    Apr 9, 2014
    I will go ahead and install a heat sink just in case. It will make my board look cool too!
     
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