Sensitive-Gate Triac or Non-Sensitive-Gate Triac whic one is better for mcu dimmer?
i dont know which oone is better for fan dimmer and what is meant by sensitive and non sensitive?
If you can use opto-coupler then that's not problem to use sensitive or non-sensitive triac (i think)
you can use opto-triac instead of opto coupler and triac if you no need to high power management.
If you use sensitive-gate triacs, you will require less current to turn them on. Non-sensitive-gate triacs require more current but offer much better dV/dT values. However, since you're using an opto-coupler/opto-triac, then gate drive current isn't that big an issue, so I would recommend that you use non-sensitive-gate triacs.