FOD4218T

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Optoisolators are a type of electrical component or device used to isolate one electrical circuit from another. The FOD4218T is a type of optoisolator specifically designed to switch on and off a Triac or SCR (silicon-controlled rectifier) output circuit, allowing for precise control of a power source. In this article, we will explain the application fields and working principle of the FOD4218T.

Application Fields

The main application field for the FOD4218T is applications which require the ability to switch on or off a high-power circuit in an electrically isolated manner. Examples of these applications include controlling motor speed, controlling MOSFET or IGBTs, and controlling the brightness of lamps. The FOD4218T is also well suited to the control of light dimmers, air conditioning systems, and other applications where multiple power stages need to be controlled in a safe, reliable manner.

Working Principle

The FOD4218T uses a light-emitting diode (LED) and a photo-sensitive transistor (OPT) to provide electrical isolation between the input and output. The LED is optically coupled to the OPT, and the combination is typically referred to as an optocoupler. As current is supplied to the LED, the light output causes the OPT to conduct, thereby allowing current to flow through the circuit. The FOD4218T is designed to switch on a Triac or SCR output circuit, allowing for precise control of a power source. The circuit has a minimum input current of 60mA, and a maximum on-resistance of 45mΩ.

The FOD4218T is designed to operate at an input voltage of up to 30V and has a reverse voltage protection. The reverse breakdown voltage is typically 50V, and the forward voltage drop is typically 0.4V. The circuit also has a surge protection of 5.5V.

The FOD4218T is capable of handling high power applications due to its wide operating temperature range from -40℃ to +125℃. The device also has a thermal shutdown circuit to protect itself from over-current conditions. The device is also designed to meet UL, CUL and VDE safety standards.

The FOD4218T is a reliable optoisolator used to control high-power applications in a safe, isolated manner. It has a wide operating temperature range and is designed to meet safety standards. It is well-suited for motor speed control, MOSFET or IGBT control, and light dimmer control.

The specific data is subject to PDF, and the above content is for reference