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I know this is an old post.The current ratings is for the optocoupler, meaning it can lead a max ampere of 60mA through the led inside. This is why you put a current limiting resistance in series with the led, to limit it's current to a nice level for the optocoupler and the arduino. This will also increase the lifetime of the optocoupler.So, you shouldn't run neither the opocoupler or an arduino output at 60mA at all, if you want them to last for a while. MT.