MOC3021 Optoisolators: Pinout, Circuit and Equivalent

UTMEL

Published: 06 August 2021 | Last Updated: 06 August 2021

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MOC3021

MOC3021

Rochester Electronics, LLC

TRIAC OUTPUT OPTOCOUPLER

Purchase Guide

TRIAC OUTPUT OPTOCOUPLER

MOC3021 is a non-zero crossing-based optoisolator consists of gallium arsenide infrared emitting diodes, optically coupled to a silicon-based triac. This article enforces pinout, datasheet, circuit, and other details about MOC3021.

This video is about how to use MOC3021.

Optocoupler/Optoisolator Tutorial | PC817 MOC3021 | How to use? | Pinout

MOC3021 Pinout

moc3021 pinout.jpg

moc3021 pin configuration.png

MOC3021 Description

The MOC3021 is a Zero-Crossing TRIAC driven Optocoupler or Optoisolator. As we know the term Optocoupler/optoisolator means the same that is we use light to indirectly coupled to sets of circuits. The specialty of MOC3021 is that it has Zero-Crossing ability and is driven by a Triac.


MOC3021 Features

  • 400 V Phototriac Driver Output

  • Gallium-Arsenide-Diode Infrared Source and Optically-Coupled Silicon Traic Driver (Bilateral Switch)

  • UL Recognized . . . File Number E65085

  • High Isolation . . . 7500 V Peak

  • Output Driver Designed for 220 Vac

  • Standard 6-Terminal Plastic DIP

  • Directly Interchangeable with Motorola MOC3020, MOC3021, MOC3022, and MOC3023


Specifications

Rochester Electronics, LLC MOC3021 technical specifications, attributes, parameters and parts with similar specifications to Rochester Electronics, LLC MOC3021.
  • Type
    Parameter
  • Mounting Type

    The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.

    Through Hole
  • Package / Case

    refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.

    6-DIP (0.300, 7.62mm)
  • Current-Hold(Ih)
    100μA
  • Current-LED Trigger(Ift)(Max)
    15mA
  • Number of Elements
    1
  • Operating Temperature (Min.)
    -40°C
  • Voltage-Off State
    400V
  • Zero-Crossing Circuit
    No
  • Packaging

    Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.

    Tube
  • JESD-609 Code

    The "JESD-609 Code" in electronic components refers to a standardized marking code that indicates the lead-free solder composition and finish of electronic components for compliance with environmental regulations.

    e0
  • Pbfree Code

    The "Pbfree Code" parameter in electronic components refers to the code or marking used to indicate that the component is lead-free. Lead (Pb) is a toxic substance that has been widely used in electronic components for many years, but due to environmental concerns, there has been a shift towards lead-free alternatives. The Pbfree Code helps manufacturers and users easily identify components that do not contain lead, ensuring compliance with regulations and promoting environmentally friendly practices. It is important to pay attention to the Pbfree Code when selecting electronic components to ensure they meet the necessary requirements for lead-free applications.

    no
  • Part Status

    Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.

    Obsolete
  • Moisture Sensitivity Level (MSL)

    Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures

    1 (Unlimited)
  • Terminal Finish

    Terminal Finish refers to the surface treatment applied to the terminals or leads of electronic components to enhance their performance and longevity. It can improve solderability, corrosion resistance, and overall reliability of the connection in electronic assemblies. Common finishes include nickel, gold, and tin, each possessing distinct properties suitable for various applications. The choice of terminal finish can significantly impact the durability and effectiveness of electronic devices.

    TIN LEAD
  • Additional Feature

    Any Feature, including a modified Existing Feature, that is not an Existing Feature.

    UL RECOGNIZED
  • Voltage - Isolation

    Voltage - Isolation is a parameter in electronic components that refers to the maximum voltage that can be safely applied between two isolated points without causing electrical breakdown or leakage. It is a crucial specification for components such as transformers, optocouplers, and capacitors that require isolation to prevent electrical interference or safety hazards. The voltage isolation rating ensures that the component can withstand the specified voltage without compromising its performance or safety. It is typically measured in volts and is an important consideration when designing circuits that require isolation between different parts of the system.

    5300Vrms
  • Output Type

    The "Output Type" parameter in electronic components refers to the type of signal or data that is produced by the component as an output. This parameter specifies the nature of the output signal, such as analog or digital, and can also include details about the voltage levels, current levels, frequency, and other characteristics of the output signal. Understanding the output type of a component is crucial for ensuring compatibility with other components in a circuit or system, as well as for determining how the output signal can be utilized or processed further. In summary, the output type parameter provides essential information about the nature of the signal that is generated by the electronic component as its output.

    Triac
  • Configuration

    The parameter "Configuration" in electronic components refers to the specific arrangement or setup of the components within a circuit or system. It encompasses how individual elements are interconnected and their physical layout. Configuration can affect the functionality, performance, and efficiency of the electronic system, and may influence factors such as signal flow, impedance, and power distribution. Understanding the configuration is essential for design, troubleshooting, and optimizing electronic devices.

    SINGLE
  • Number of Channels
    1
  • Forward Current-Max

    Forward Current-Max is a parameter used to specify the maximum amount of current that an electronic component, such as a diode or LED, can safely handle when it is forward-biased. This parameter is crucial for determining the operating limits of the component to prevent damage or failure due to excessive current flow. Exceeding the specified Forward Current-Max can lead to overheating, degradation of the component, or even permanent damage. It is important to carefully consider this parameter when designing circuits to ensure the component operates within its safe limits.

    0.05A
  • Current - DC Forward (If) (Max)

    The parameter "Current - DC Forward (If) (Max)" in electronic components refers to the maximum forward current that can safely pass through the component without causing damage. This parameter is typically specified in datasheets for diodes and LEDs, indicating the maximum current that can flow through the component in the forward direction. Exceeding this maximum current rating can lead to overheating and potentially permanent damage to the component. It is important to ensure that the current flowing through the component does not exceed this specified maximum to maintain proper functionality and reliability.

    50mA
  • Input Trigger Current-Nom

    The parameter "Input Trigger Current-Nom" in electronic components refers to the nominal current level required to trigger a specific function or operation within the component. This parameter is crucial for determining the threshold at which the component will respond to an input signal or command. It helps in ensuring that the component functions reliably and consistently within its specified operating conditions. Understanding the Input Trigger Current-Nom is essential for designing circuits and systems that rely on precise triggering mechanisms for proper operation.

    8mA
  • RoHS Status

    RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.

    Non-RoHS Compliant
0 Similar Products Remaining

MOC3021 Logic Diagram

moc3021 logic diagram.png

MOC3021 CAD Model

Symbol

moc3021 symbol.png

Footprint

moc3021 footprint.png

MOC3021 Applications

  • Solenoid/Valve Controls

  • Lamp Ballasts

  • Interfacing Microprocessors to 115/240 Vac Peripherals

  • Motor Controls

  • Incandescent Lamp Dimmers


MOC3021 Application Circuit

moc3021 application circuit.png

MOC3021 Alternatives

MCT2E (non-Zero transistor), MOC3041 (Non-Zero Cross TRIAC), FOD3180 (High-Speed MOSFET)

MOC3021 Equivalent

The MOC3043 devices consist of gallium arsenide infrared emitting diodes optically coupled to a monolithic silicon detector performing the function of a Zero Voltage Crossing bilateral triac dr.


MOC3021 vs. MOC3041

The MOC3041 is rated for 1 amp, which is ~120 watts at 120 VAC. The MOC3021 is rated for 100 mA, which is ~12 watts. For loads less than this, either unit will work.


Where to use MOC3021

The MOC3021 is normally used to control the AC appliance, such as the brightness of the bulb, the speed of the motor, etc. Either way, due to its limited current rating, an optocoupler will not be allowed to drive loads directly.


How to use MOC3021

The MOC3021 can be used to switch loads by just turning the LED on or off, or we can also use PWM signals to switch the LED and thus the TRIAC. When we switch the TRIAC using PWM signals then the output voltage across the load can be controlled thus controlling the speed/brightness of the load.


MOC3021 Dimension

moc3021 dimension.jpg

MOC3021 Manufaturer

Rochester Electronics is the largest continuing source manufacturer of semiconductors in the world. With product licensing from leading manufacturers such as Analog Devices, Altera, Cypress, Fairchild, Freescale, Infineon, Intel, NXP, Renesas, and Texas Instruments, Rochester continues to manufacture and distribute mature products. For industrial, transportation, and hi-reliability markets, this extension of the product life is critical for long-term production and maintenance. With over 100,000 products and 15 billion units in stock, no other company compares to our selection, capabilities, or solutions.


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Datasheet PDF

Download datasheets and manufacturer documentation for Rochester Electronics, LLC MOC3021.
Frequently Asked Questions

What is MOC3021?

The MOC3021 is a Zero-Crossing TRIAC driven Optocoupler or Optoisolator. As we know the term Optocoupler/optoisolator means the same that is we use light to indirectly coupled to sets of circuits. The specialty of MOC3021 is that it has Zero-Crossing ability and is driven by a Triac.

What is the use of MOC3021?

MOC3021 is used to operate high load TRIAC. In industrial applications, the IC has vast usage. IC is also used as switching in Traffic Lights. Motor control and Fan speed control also use MOC3021 with the microcontroller.
MOC3021

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