Opto-TRIAC or Opto-TRIAC+Power TRIAC?
MJHanagan
Posts: 189
I need turn on a small AC powered solenoid device. My initial thought was to use an opto-coupled driver (e.g. a Fairchild MOC3022) and a power TRIAC (e.g. an NXP BT138-600). The device needs to be capable of switching an AC voltage as low as ~9 VAC (RMS) as well as a chopped ~18 VAC (RMS) voltage. I was looking at the specs for the MOC3022 and saw that it has a maximum output current of 1 A (RMS) so I am wondering if I even need the second power TRIAC? If the current through the solenoid is <1 A (RMS) can I simply use just the MOC3022 without the power TRIAC?
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