optocoupler input saturation current

[vlad777]

What optocoupler has the lowest led diode input current
that brings the output transistor to saturation?
CNY17 has 10mA.
I am connecting the input to 220V 50Hz so I need
low input led current to save watts of the input
resistor.

 

[MrAl]

Hi,

This partly depends on what the load will be. What are you connecting
to the output?
There are many opto's out there, but i think 1ma might be a good lower
limit to count on, provided you can rig the output to only draw 1ma too.
I guess you only need 50Hz frequency response then too?