The MOC3021 can be used to switch loads by just turning the LED on or off, or we can also use PWM signals to switch the LED and thus the TRIAC. A simple circuit diagram in which an AC bulb is controlled using a microcontroller is shown below. They are normally connected to another power switch like a Triac in our case, this TRIAC will be able to provide enough current to drive the loads and will be controlled using the opto-coupler. Either way, an opto-coupler will not be allowed to drive loads directly due to its limited current rating. The MOC3021 is normally used to control AC appliance, like brightness of a Bulb, speed of a motor etc. So if you are looking for a opto-isolator to control a AC application through DC then this IC might be the right choice for you. Since the output is controlled we can control the intensity of the light or the speed of a AC motor. This features of MOC3021 makes it an ideal choice for controlling high voltage AC loads through digital controllers like MPU/MCU. It also has a decent rise and fall time and hence can be used to control the output voltage. Also since it has zero-crossing ability, when the AC load is switched on for the first time the TRIAC will start conductiong only after the AC wave reaches 0V this way we can avoid direct peak voltages to the Load and thus preventing it from getting damaged. Since the output is driven by a TRIAC we can drive loads upto 400V and the triac can conduct in both directions hence controlling AC loads will not be a problem. The speciality of MOC3021 is that it has Zero-Crossing ability and is driven by a Triac. As we know the term Optocoupler/optoisolater means the same that is we use light to indirectly couple to sets of circuits. The MOC3021 is a Zero-Crossing TRIAC driven Optocoupler or Optoisolator. MCT2E (non-Zero transistor), MOC3041 (Non-Zero Cross TRIAC), FOD3180 (High-Speed MOSFET), Where to use MOC3021 Phototransistor Optocoupler Available as 6-pin PDIP with and without M-suffix.TRIAC output terminal voltage: 400V (max).
#4n25 optical isolator driver#
The optoisolators allow two circuits to exchange signals without making any electrical connection. Optocoupler is made of light-emitting and light-sensing devices with no internal connection except light bean. MOC3021 is Triac driven a zero-crossing optocoupler. MOC3021 MOC-30 Optocoupler TRIAC Driven Opto-isolator IC DIP 6 Pin Leads Optocoupler IC Connectors, Cables, Header, Jack & Socket.Cameras, Oscilloscope, Microscope & Magnifier.
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