Question about Optocoupler H11G1

[financecatalyst]

Thanks. I am actually switching a 24v relay. Minimum current is 30mA, 35 or above to be safe. Would it be wise to assume:
1) 500%is at 5v. At 24v will be 6 or 7 times?
2) if the above assumption is wrong purely on switching voltage basis, then passing 5ma in led should make it true-ish? As 5 times is for 1ma!

[HenrikOlsson]

For a switching type application you want the transistor to be fully saturated. If you're not worried about power consumption, which I guess you're not since you're using a relay, just run 15-20mA thru the LED and measure the voltage across collector/emitter, in saturation it should be around 1V or less. If it is you can decrease the LED current, if it isn't you need to increase it.

/Henrik.