Hey guys, i need some guidance im thinking about using a not gate, here is what im thinking...

The issue is that V out goes to another circuit that the presence of vcc will affect its function, so i assumed a diode will get the job done but when input is high v out will sink around 12 amps am i on the right track?

 

Scroll down to Section 1.4.3.1: http://www.cise.ufl.edu/~mssz/CompOrg/CDAintro.html

12 amperes seems like a lot of current for "regular" transistor. Maybe a buffer would be better choice instead of diode. Optocoupler/opto-isolator is another option.