I have an Arduino Leonardo board with the voltage regulator marked "W34 7CE50Z". I didn't find much documentation about it on the Internet but it should behave like the one indicated in the board schematics and, as I understood, some boards use this other regulator.
Anyway, I tried something bad ie. using the board with a DC unregulated power rated for 12 V but which outputs 18.5 V as open-circuit voltage... This is playing close to the limits but should be safe - at least for a few moments.
But things began pretty bad as I think the regulator is destroyed with a short to ground. I'll try to remove it to see if the MCU has taken damage as well but my question is:
is it plausible that about 18 V applied thru the jack for less than 30 seconds have destroyed the regulator? Since, for the regulator on the schematics, the maximum rated voltage is 20 V?
I'm asking because I don't really see what else could have destroyed it, no short or overload were applied. Thx for help and sorry for my bad English