MOC3042 Zero-Cross Optoisolator Triac Driver 6 Pin
The MOC3042 Zero-Cross Optoisolators Triac Driver 6 Pin is a zero-cross optoisolator triac driver this 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 and designed for interfacing low-voltage control circuits with high-voltage AC loads. It integrates a gallium arsenide infrared emitting diode (IRED) that optically triggers a silicon bilateral switch triac, providing safe electrical isolation between input and output. The zero-crossing feature ensures switching occurs only when the AC load voltage is near zero, minimizing electrical noise, reducing inrush current, and improving overall system reliability. Packaged in a compact 6-pin DIP, the MOC3042 is widely used in AC load switching, solid-state relays, lamp dimmers, and motor control applications, offering high safety and efficient performance in industrial and consumer electronics.
Features
- Zero-crossing triac driver for low noise switching.
- High isolation voltage between input and output (typically 7500 Vrms).
- Input LED trigger current as low as 15 mA.
- Compact 6-pin DIP package for easy PCB mounting.
- Provides 5 kV to 7.5 kV isolation resistance.
- Designed for interfacing logic level signals to AC loads.
- High static dv/dt immunity for reliable operation.
- Suitable for 115/230 VAC line switching applications.
- Low power triggering with efficient optocoupler design.
- UL and VDE recognized for safety compliance.
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 |
Specifications
| Product Attribute | Attribute Value |
| Product Category | Triac & SCR Output Optocouplers |
| Subcategory | Optocouplers |
| Series | MOC3042M |
| Datasheet | MOC3042 |
| Mounting Style | Through Hole |
| Package / Case | PDIP-6 |
| Packaging | Tube |
| Zero-Crossing Circuit | With Zero-Crossing Circuit |
| Output Type | Photo Triac |
| Number of Channels | 1 Channel |
| Isolation Voltage | 5250 Vrms |
| If – Forward Current | 60 mA |
| Vf – Forward Voltage | 1.25 V |
| Pd – Power Dissipation | 250 mW |
| Off-State Output Voltage (VDRM) | 400 V |
| Minimum Operating Temperature | -40 °C |
| Maximum Operating Temperature | +85 °C |
| Maximum Trigger Current | 10 mA |
| Zero-Crossing Voltage | 20 V |
Dimensions
Applications
- Solid-state relays for AC load switching.
- Lamp dimmers and lighting controls.
- Motor speed control circuits.
- AC switching for resistive and inductive loads.
- Home appliances control (e.g., fans, heaters, ovens).
- Industrial automation systems.
- Phase control in power management circuits.
- Noise-sensitive AC switching applications.
- Safety isolation between logic circuits and high-voltage AC lines.
Package Contents
- 1 X MOC3042 Zero-Cross Optoisolator Triac Driver 6 Pin
