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MOC3009 from III-V

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MOC3009

Manufacturer: III-V, MOTOROLA

Photon coupled isolator. Ga As infrared emitting diode & light activated triac driver.

Partnumber Manufacturer Quantity Availability
MOC3009 III-V, MOTOROLA 512 In Stock

Description and Introduction

Photon coupled isolator. Ga As infrared emitting diode & light activated triac driver. # Introduction to the MOC3009 Optocoupler  

The MOC3009 is a solid-state optocoupler designed to provide electrical isolation between input and output circuits while enabling signal transmission. As part of the optocoupler family, it consists of an infrared LED optically coupled to a phototriac, allowing for reliable switching in AC applications without direct electrical connection.  

This component is commonly used in applications requiring noise immunity, voltage level shifting, or isolation in control circuits. The MOC3009 is particularly suited for driving triacs, thyristors, or other power-switching devices in industrial automation, home appliances, and lighting controls. Its zero-crossing detection feature ensures smooth switching, reducing electromagnetic interference (EMI) and minimizing inrush currents.  

Key features of the MOC3009 include a high isolation voltage (typically 5,000 Vrms), a compact DIP-6 package, and compatibility with a wide range of input control signals. The built-in zero-crossing circuit enhances performance in AC load switching, making it ideal for dimmers, motor controls, and solid-state relays.  

Engineers favor the MOC3009 for its robustness, ease of integration, and ability to enhance system safety by preventing high-voltage transients from affecting low-voltage control circuits. When designing with this optocoupler, proper heat dissipation and current-limiting resistors should be considered to ensure optimal performance and longevity.  

Overall, the MOC3009 is a versatile and reliable solution for isolated switching in AC power applications.

Application Scenarios & Design Considerations

Photon coupled isolator. Ga As infrared emitting diode & light activated triac driver.

Alternative Part Number

  • H11A1 --: Industry-standard 6-pin phototransistor optocoupler with similar CTR and isolation ratings, widely available and pin-compatible in most circuits.
  • 4N25 --: Classic 6-pin phototransistor optocoupler offering comparable isolation voltage and current transfer ratio, commonly used as a drop-in substitute.
  • PC817 --: Popular 4-pin phototransistor optocoupler with similar forward current and isolation specs; requires minor footprint adjustment but is a cost-effective alternative.
  • TLP521-1 --: Single-channel transistor-output optocoupler with similar electrical characteristics, suitable drop-in replacement in most designs.

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