Current Pin Vin Arduino Uno

Current Pin Vin Arduino Uno

Hi, i have a project with motors and a Moster Moto Shield of Sparkfun. I need 12v on motors, then i want supply arduino by pin Vin.
Arduino limits the current on Vin pin? How much max current?

I want to put a led between 12v and Vin, so I need to know the maximum current for to not damage led.

The Vin pin goes to the on-board 5V regulator on the Uno, the current taken depends on all the loads on the 5V rail, Arduino and anything else supplied from it. At turn on there is a current spike as the electrolytic decoupling capacitors in the Uno charge up, that could easily be over an amp.