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Is it safe to run an arduino pro mini 3.3v by 5v? I mean directly connect 5v to vcc not raw pin.

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    Have you examined the schematic yet? – Ignacio Vazquez-Abrams Jul 30 '18 at 6:47
  • Can you remove the voltage regulator? Just to be sure that it doesn't get reverse voltage. – Jot Jul 30 '18 at 8:49
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Yes you can.

The only difference between the 3.3 V and 5 V Pro Mini is the crystal and the voltage regulator.

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Yes, an 8 MHz resonator-clocked Promini will happily work at 5V vs 3.3V.

If you want, add a diode from VCC to the RAW pin to protect the regulator, altho it's datasheet does not indicate such is warranted. Anecdotally, I used about 10 of these in my fencing club powered from 5V to the VCC line for quite a few years with no such protection and they ran fine for ~ 10 years, until we closed the club.

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