The MOC3042 is a Zero-Crossing TRIAC driven Optocoupler. Meaning it has a Infra-red Light Emitting Diode (LED) inside it coupled with a TRIAC. When the LED is triggered the TRIAC is also turned on.
MOC3042 Pin Configuration
| Pin Number | Pin Name | Description |
| 1 | Anode (A) | Anode pin of the IR LED. Connected to logic input |
| 2 | Cathode (C) | Cathode pin of the IR LED |
| 3 | NC | No Connection – Cannot be used |
| 4 | Triac Main Terminal 1 | One end of the Triac which is present inside the IC |
| 5 | NC | No Connection – Cannot be used |
| 6 | Triac Main Terminal 2 | Other end of the Triac which is present inside the IC |
MOC3042 Features and Specifications
- Opto-isolator with Zero-Crossing Triac Driver
- Input LED Diode Forward Voltage: 1.25V
- LED Forward Trigger Current: 10mA
- TRIAC output terminal voltage: 400V (max)
- TRIAC peak output current: 1A
- Available as 6-pin PDIP
Note: More details can be found in the MOC3042 datasheet which is available for download at the end of this page.
Applications
- AC Light dimmers
- Contactor / Relay Control
- AC motor speed control
- Noise coupling circuits
- Controlling AC loads using MCU/MPU
- Ac/DC Power control
- Solenoid / Valve control
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