I'm currently using a 5V current transducer that's connecting to an I/O device ADC input. I'm trying to protect my ADC input from going over 5V by using a zener diode . The reason this is coming about, is a current I'm trying to measure has a high inrush current on start up, and I don't want to damage the system. On the zener datasheet, it says \$I_z=5mA\$
Does this mean it will only starts clamping at 5mA or does it mean it will not work after 5mA?
And is it necessary to have a current limiting resistor? What will happened if there's no resistor?