Optocoupler Current Transfer Ratio

[AJBotha]

Hi Guys

I am having some trouble understanding Current Transfer Ratio for optocouplers.
I have a simple application where I activate a single channel transistor-output optocoupler.

I provide the LED side of the opto with, say, 10mA and that enables to transistor for the outside user to detect that I have changed state.

Looking at the VOS671A from Vishay,
I can get the VOS617A-2X001T part and the VOS617A-X001T for the same price.

The one comes from the 50-600 CTR bin and the other from the 63-125 CTR bin.
How do I know which is the best for not only my use, but also versatile for future projects?

Thank you!

 

[KlausST]

Hi,

i`d say the 50-600 CTR (no binning) is for switching purpose, where the exact CTR is not necessary.
And the 63-125 (binning) is for linear operation, where the output should vary linearely to input current. Here the CTR needs to be more precise.

Klaus

 

[AJBotha]

Hi,

i`d say the 50-600 CTR (no binning) is for switching purpose, where the exact CTR is not necessary.
And the 63-125 (binning) is for linear operation, where the output should vary linearely to input current. Here the CTR needs to be more precise.

Klaus

Thank you.
I want to use it as a switch, so I will go for the no-binning.
AJ