MOC3041 Zero Cross Optoisolator Triac Driver IC DIP-6

MOC3041 Zero Cross Optoisolator Triac Driver IC DIP-6 is a high-performance component designed to provide optically isolated triggering for power Triacs, especially in AC load switching applications. This specialized device features a built-in zero-crossing detection circuit. Consequently, it significantly minimizes electrical noise and transient surge currents by ensuring the Triac is only triggered when the AC voltage waveform crosses zero. Utilizing an infrared LED coupled with a photo-Triac output, the MOC3041 allows low-voltage digital circuits (like microcontrollers) to safely control high-voltage AC loads. Furthermore, this capability offers crucial isolation that protects sensitive control electronics from the harsh power line environment. Therefore, you should integrate the MOC3041 into your designs to achieve precise, reliable, and noise-reduced switching of motors, lamps, and solenoids.

Key Features:

• Zero-Crossing Circuitry: The device incorporates a zero-crossing detector, enabling the Triac to switch on only near the zero voltage point of the AC cycle, thereby reducing electromagnetic interference (EMI).
• High Isolation Voltage: This optoisolator provides an input-to-output isolation voltage of up to 5000 V_RMS, ensuring maximum safety and electrical separation between the control and power circuits.
• Logic-Compatible Input: The input infrared LED is designed for direct driving from common logic families (TTL, CMOS), requiring a low trigger current to activate the output.
• Low Peak Blocking Voltage: Features a minimum blocking voltage (V_DRM) of 400V, making it suitable for driving Triacs on standard 120 V_AC lines.
• Standard DIP Package: The 6-pin Dual In-line Package (DIP) ensures easy through-hole mounting and widespread compatibility with existing PCB layouts.

Technical Specifications:

• Zero Crossing Capability: Yes (Guaranteed turn-on at V_TM ≤ 20 V)
• Peak Blocking Voltage (V_DRM): 400 V minimum
• Input LED Forward Voltage (V_F): Typically 1.15 V (≤ 1.5 V max)
• Maximum Input Trigger Current (I_FT): 15 mA max (The current required to activate the photo-Triac)
• On-State Current (I_TM Peak): 1 A (Non-repetitive peak pulse current)
• Isolation Voltage (V_ISO): 5000 V_RMS minimum
• Operating Temperature Range: −40°C to +85°C

Mechanical Specifications:

• Package Type: DIP-6 (Through-Hole)
• Mounting: Through-Hole Technology (THT)
• Lead Frame Material: Copper Alloy
• Case Material: Black Epoxy Resin (UL 94 V-0 Flammability Rated)

Dimensions:

• Body Length: ≈ 6.9 mm
• Body Width: ≈ 6.5 mm
• Pin Pitch (Between pins): 2.54 mm (0.1 inch)
• Row Spacing (Between rows): 7.62 mm (0.3 inch)
• Total Height: ≈ 3.5 mm (Seated height)

Pinout and Wiring:

• Pin 1 (Anode): Connect to the positive supply (V_CC) of the control circuit via a current-limiting resistor (R_limit).
• Pin 2 (Cathode): Connect to the microcontroller’s GPIO pin or ground (GND) to turn the LED on.
• Pin 4 (MT1/Cathode): Connect to the Main Terminal 1 of the power Triac and one side of the AC line/load.
• Pin 6 (MT2/Anode): Connect to the Gate of the power Triac.
• Pin 5 (No Connection): This pin is intentionally left unconnected for better creepage distance and electrical isolation.

Datasheet Reference:

• Download ON Semiconductor MOC3041 Datasheet

Commonly Used in:

• Solid State Relays (SSRs): The MOC3041 forms the core driver stage for many zero-crossing solid-state relays.
• Microcontroller Interfaces: Engineers widely use it to interface 5V/3.3V logic to high-power AC devices.
• Home Automation Systems: Essential for safe and quiet switching of lights and appliances in smart homes.

Applications:

• AC Motor Control: Provides noise-free switching for low-power fans and small AC motors.
• Lighting Control: Switching AC lamps, fluorescent ballasts, and LED drivers in non-dimming applications.
• Solenoid and Valve Switching: Safely drives high-voltage solenoids and power line-operated valves.

Equivalent Models:

• MOC3042 / MOC3043: In short, these are higher sensitivity versions (lower I_FT) within the same zero-cross family, often interchangeable where lower drive current is preferred.
• TCMT1600 (Vishay): A similar zero-crossing Triac driver in an SMT package, functionally equivalent to the MOC3041 series.
• LTV-3041 (Lite-On): A direct cross-reference part number providing the same electrical characteristics and zero-cross feature.

Package Includes:

• 1 x MOC3041 Zero Cross Optoisolator Triac Driver IC DIP-6