What is the Maximum Current an Arduino can Supply?

Question

I was wondering how much my Arduino I/O pin can output when it is set at Output and is at High.

I am using an Arduino Uno R3.

Thanks in Advanced.

@brhans but it seems to have an answer already. So i think im just gonna keep it here — Bryan, Jan 8, 2016 at 4:23
Possible duplicate of How much current can I draw from the Arduino's pins? — uint128_t, Jan 8, 2016 at 4:47

bigjosh · Accepted Answer · 2016-01-08 04:19:11Z

6

40.0mA.

The Arduino UNO Digital IO pins are connected directly to the IO pins on the ATMEGA328P processor.

From page 299 of the data sheet for that processor...

Note that there is also a total current limit for all output pins combined, and that the voltage starts to drop as the current goes up.

answered Jan 8, 2016 at 4:19

bigjosh

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You should probably note that it's never a good idea to go anywhere near the "Absolute Maximum Ratings". Perhaps include the notice that's referred to by the asterisk on that page in the datasheet.
– Roger Rowland
Jan 8, 2016 at 5:23

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