Arduino nano supply


What is the max voltage I can supply the Arduino nano?

Because here:

site 1

it says 7-10 Volts from pin 30

and here:

site 2

it says 6-20 Volts from pin 30

Thank you

Why the question? Is there a particular voltage do you want to power the Nano with?

The higher the voltage, the more the the Nano will be in danger of overheating, which will shorten its life and could result in damage, especially if you draw more current from the 5V pin or the digital outputs.

The best voltage is probably around 7~7.5V for an external unregulated power supply. But better still is a regulated or switch-mode 5V power supply. You would connect that to 5V instead of Vin.

If you need to use an existing supply voltage of between 12V and 20V in your project, another option is to use a dc-dc convertor module. These can often accept input voltages up to 30V, can be adjusted to output 5V and are much more efficient than regulators.

Yes, 12 Volt.

Always go to the manufacturers site of the NANO you are using - the Arduino site says max 12v , for their Nano; don’t rely on stuff from other sites .

Even the official Arduino product information has conflicting information.

From the "TECH SPECS" tab of Arduino Online Shop

Input Voltage 7-12 V

From the "DOCUMENTATION" tab of Arduino Online Shop


The Arduino Nano can be powered via the Mini-B USB connection, 6-20V unregulated external power supply (pin 30),

Likely the 20 V comes from the absolute maximum rating stated in the datasheet of the voltage regulator. But we know that 12 V is the maximum sane supply voltage.

This problem has been reported to the Arduino developers, but unfortunately there has been no action yet:

At 12V input, the regulator can supply about 300 mA before overheating. If you have 5V components that total to more than 300 mA you will have to supply a lower input voltage. 7V to 7.5V is ideal.

At 12V input, the regulator can supply about 300 mA before overheating.

Wishful thinking.
I think the regulator on a Nano can't dissipate a lot more than 0.5watt long term.
With a 7volt drop (12-5), that's 0.5/7= ~70mA.
The Nano uses 30mA from that, so only 40mA left to play with.

12volt is the danger zone for a Nano. Just ok if you draw very little current from any pin.
20volt in the Arduino specs is just stupid sales talk.

Get one of these, adjust it to 5V (test with multimeter) and connect it to the 5V pin on the Nano.
s-l300 (26).jpg

s-l300 (26).jpg