Zero-Crossing Triac Driver – MOC3041

The MOC303XM and MOC304XM devices consist of a AlGaAs infrared emitting diode optically coupled to a monolithic silicon detector performing the function of a zero voltage crossing bilateral triac driver. MOC3041

They are designed for use with a triac in the interface of logic systems to equipment powered from 115 VAC lines such as teletypewriters, CTRs, solid-state relays, industrial controls, printers, motors, solenoids and consumer appliances, etc.

  • Simplifies logic control of 115 VAC power
  • Zero voltage crossing
  • dv/dt of 2000 V/µs typical, 1000 V/µs guaranteed

Motorola used to make these then it was Infineon Technologies now Isocom also makes it

MOC3041 Zero Crossing Triac Output, 6 Pin

See the original Motorola Application below.

MOC3041 Zero Crossing Triac Output

These were used by me to make solid state relays. Look at the circuits here Power Electronics Circuits. The were used to control Heaters from DC control signal from a Proportional Temperature Controller. The Magnetic Contactors can be avoided for lower powers. At higher powers SCR banks become a bit expensive. The SSR has no mechanical wear and tear but heat up at high currents. So if we overrate by 5 Times then it is an excellent solution for lower power controls upto 5 Kilo Watts. The cycle time of Contactors must be 20-60 Seconds to make it last long. In a SSR a one second cycle time is possible as 10-20mS is the switching speed due to zero crossing.

  • Spread Spectrum Scene Online
    Spread Spectrum Scene Online RF chips, white papers, FCC, a variety of specialty books on various wireless/ spread spectrum / RF areas, and a wide [...]
  • USB.org – Universal Serial Bus and Wireless USB
    Universal Serial Bus (USB) connects more than computers and peripherals. It has the power to connect you with a whole new world of PC experiences. [...]
  • Equipment Control using Embedded InternetEquipment Control using Embedded Internet
    I will give a simple example for the purpose of understanding and assimilation of the concept. Consider the Toaster a Vital Home Appliance, Build a [...]
  • The Spice in Analog Design
    Analog Designers created Spice, Analog Design Professionals are adding their experience in many commercial and free spice EDA tools. When you are creating a new [...]
  • Instrumentation for Process Control
    A Resource of Value for Industrial Engineering. Here is an Online Textbook for learning advanced process control concepts. The Process Control Education Web Site Industrial [...]
  • Lead Acid Batteries Usage in Power SystemsLead Acid Batteries Usage in Power Systems
    The Lead Acid Batteries are used in Automobiles and UPS – Uninterrupted Power Supplies. Battery Banks and Arrays are used in Home and Industrial Power [...]
  • Temperature Calibrator Milli Volt Source
    This is a Milli-Volt and Milli-Amp Source for Calibration of Temperature Measurement and Control Instruments using Thermocouples. There is also a Passive Variable Resistance Source [...]
  • Learning Electronics – 01
    How To Learn Electronics Theory must be studied once and referred again and again as you do practicals. One is by building DIY projects and [...]
About delabs 600 Articles
delabs is a web-service for product design and development.

Be the first to comment

Leave a Reply