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MOC3043M from FAIRCHILD,Fairchild Semiconductor

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MOC3043M

Manufacturer: FAIRCHILD, FSC

6-Pin DIP 400V Zero Crossing Triac Driver Output Optocoupler

Partnumber Manufacturer Quantity Availability
MOC3043M FAIRCHILD, FSC 2004 In Stock

Description and Introduction

6-Pin DIP 400V Zero Crossing Triac Driver Output Optocoupler # Introduction to the MOC3043M Optocoupler  

The MOC3043M is a highly reliable optocoupler designed for interfacing low-voltage control circuits with high-voltage AC loads. As part of the MOC30xx series, it integrates a gallium arsenide infrared LED and a silicon triac, providing electrical isolation and noise immunity in switching applications.  

This optocoupler features zero-crossing detection, ensuring that the triac triggers only when the AC voltage crosses zero. This minimizes inrush currents and reduces electromagnetic interference (EMI), making it ideal for resistive and inductive loads in appliances, industrial controls, and lighting systems.  

Key specifications include a peak repetitive off-state voltage (VDRM) of 400V, a maximum LED forward current of 60mA, and an isolation voltage of 5,000V RMS. The built-in snubberless triac allows direct interfacing with AC mains without additional circuitry, simplifying design and improving reliability.  

The MOC3043M is available in a compact 6-pin DIP package, ensuring compatibility with standard PCB layouts. Its robust construction and compliance with safety standards such as UL and IEC make it a preferred choice for applications requiring safe and efficient AC power control.  

By combining isolation, zero-crossing switching, and high-voltage handling, the MOC3043M provides a dependable solution for solid-state relay replacements and AC load control in various electronic systems.

Application Scenarios & Design Considerations

6-Pin DIP 400V Zero Crossing Triac Driver Output Optocoupler

Alternative Part Number

  • MOC3043SR2M --: Same zero-cross triac driver function and pinout from the successor brand of Fairchild, widely available and directly drop-in compatible.
  • MOC3043X --: Equivalent 6-pin zero-cross optocoupler triac driver with matching CTR and isolation ratings, suitable as a second-source alternative.
  • TLP3043 --: Comparable zero-cross phototriac driver in a DIP-6 package with similar trigger and blocking voltage specs, usable with minor layout checks.
  • TLP3052 --: Zero-crossing triac driver optocoupler with similar 5-pin DIP package and comparable isolation voltage, suitable functional replacement.
  • PC814 --: Phototriac driver optocoupler offering similar zero-crossing switching behavior and DIP package compatibility.
  • EL3043 --: Zero-crossing triac driver optocoupler with matching pinout and isolation ratings, widely available alternative.

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