MOC 3052 Random-Phase Triac Driver Optocoupler IC

Description

The MOC3052 Random-Phase Triac Driver Optocoupler IC is an essential component for safely bridging the gap between low-voltage digital electronics and high-voltage AC mains. Manufactured by ON Semiconductor, this 6-pin DIP IC contains a gallium arsenide infrared emitting diode optically coupled to a non-zero-crossing silicon bilateral voltage switch (triac driver).

Available at Tomson Electronics, the MOC3052 is specifically designed to drive larger power TRIACs (like the BT136 or BTA16) to control 110V/220V AC loads. Because it is a "random-phase" (non-zero crossing) driver, it allows you to trigger the AC waveform at any point in its cycle. This makes it the perfect choice for building custom AC light dimmers, motor speed controllers, and phase-control circuits using microcontrollers like Arduino or ESP32, while ensuring your delicate logic boards are completely electrically isolated from deadly AC voltages.

Datasheet: Click here to view/download the MOC3052 Datasheet

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Specifications

• IC Number: MOC3052
• Manufacturer: ON Semiconductor (ON)
• Package Type: 6-Pin DIP (Through-Hole)
• Output Type: Photo-Triac (Random Phase / Non-Zero Crossing)
• Peak Blocking Voltage: 600V (Suitable for 110V and 220V AC mains)
• LED Trigger Current (Ift): 10mA (Typical)
• Isolation Voltage: 4170V AC (RMS)

Applications

• AC Light Dimmers: Building custom phase-cutting dimmer circuits for incandescent bulbs or AC LED fixtures.
• Motor Speed Control: Adjusting the speed of AC fans, drills, or pumps by chopping the AC waveform.
• Solid State Relays (SSR): Designing custom DIY solid-state relays for switching high-power AC loads.
• Industrial Controls: Safely interfacing low-voltage PLCs and microcontrollers with high-voltage solenoid valves and contactors.

Frequently Asked Questions (FAQ)

Q: Can the MOC3052 drive an AC appliance directly?
A: No. The MOC3052 is only a triac driver. It is designed to safely trigger a much larger, high-power TRIAC (such as a BTA16). Attempting to run a heavy AC load directly through the MOC3052 will instantly burn it out.

Q: What is the difference between the MOC3052 and the MOC3041?
A: The MOC3052 is a "random-phase" driver, meaning it can trigger at any point in the AC wave, which is required for dimming and speed control. The MOC3041 is a "zero-crossing" driver, which only switches ON when the AC wave hits zero volts. Zero-crossing is better for simple ON/OFF switching (like a relay) because it produces less electrical noise, but it cannot be used for dimming.

Q: Do I need a resistor on the input side?
A: Yes. The input side of the MOC3052 is essentially just an infrared LED. If you are driving it from a 5V Arduino pin, you must use a current-limiting resistor (typically around 220Ω to 330Ω) to prevent burning out the internal LED.

Package Includes

• 1 × MOC3052 Random-Phase Triac Driver Optocoupler IC (ON Semi)