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MOC3021M from FSC/EL,Fairchild Semiconductor

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MOC3021M

Manufacturer: FSC/EL, FAI, FAIRCHILD, FSC

6-Pin DIP 400V Random Phase Triac Driver Output Optocoupler

Partnumber Manufacturer Quantity Availability
MOC3021M FSC/EL, FAI, FAIRCHILD, FSC 11437 In Stock

Description and Introduction

6-Pin DIP 400V Random Phase Triac Driver Output Optocoupler The **MOC3021M** is a widely used optocoupler designed for interfacing low-voltage control circuits with high-voltage AC loads. As part of the **MOC302x series**, it integrates a gallium arsenide infrared LED and a light-activated silicon bilateral switch (TRIAC driver), providing reliable electrical isolation between input and output.  

This component is particularly useful in applications requiring **AC load switching**, such as motor controls, lighting systems, and solid-state relays. The **MOC3021M** can trigger external TRIACs with minimal input current, making it suitable for microcontroller-based designs. Its **zero-crossing detection** feature ensures smooth switching by activating the TRIAC only when the AC voltage crosses zero, reducing electromagnetic interference (EMI) and voltage transients.  

Key specifications include an **input forward current** of 15 mA, an **isolation voltage** of 5,300 Vrms, and a **peak blocking voltage** of 400 V. The optocoupler's compact **6-pin DIP package** facilitates easy integration into various circuit designs.  

Engineers favor the **MOC3021M** for its **durability, noise immunity, and safety compliance**, meeting industry standards for optoelectronic isolation. Its ability to handle moderate power loads while maintaining signal integrity makes it a dependable choice for industrial and consumer electronics.  

For optimal performance, proper heat dissipation and adherence to recommended operating conditions are essential. Whether used in dimmers, relays, or automation systems, the **MOC3021M** remains a versatile solution for AC power control.

Application Scenarios & Design Considerations

6-Pin DIP 400V Random Phase Triac Driver Output Optocoupler

Alternative Part Number

  • K3021P --: Pin-compatible optocoupler triac driver with similar 400V blocking voltage and 5mA trigger current, widely used as a direct MOC3021 replacement.
  • TLP3021 --: Optoisolated triac driver with comparable 400V peak off-state voltage and 5mA LED trigger current, suitable for AC load switching applications.
  • PC3021 --: Phototriac coupler offering similar isolation and trigger characteristics, commonly cross-referenced for MOC3021 series designs.
  • EL3021 --: Pin-compatible random-phase optocoupler triac driver with similar 5kV isolation and 100mA output, widely used as a direct MOC3021 replacement.

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