FOD4218V

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The FOD4218V is an optoisolator device from Fairchild Semiconductor’s Light Sensor Optoisolator family. This device provides electrical isolation between input and output signals. It consists of a Triac, SCR Output photocoupler optically coupled to a GaAs infrared LED. This device has an isolation rating of 3000VRMS, which provides excellent protection from surges and transient signals.

The FOD4218V is designed for use in a wide variety of applications. These include motor and fan control, power supply and lighting control, and temperature control. This device also offers protection against potential damage to sensitive electronic components that are connected to the power line. It can be used in both AC and DC applications, and the input voltage range is from 4.5V to 30V.

The FOD4218V has a Versa-Mode operation, which allows for easy configuration between stable, delayed triggering, and random triggering modes. The stable mode is designed for high accuracy triggering of AC motors and other electrical equipment. The delayed trigger mode delays the output triac triggering, which is useful for controlling ripple currents or for soft-start applications. The random mode creates a varying output pulse width each time the input voltage is triggered, creating randomness in the output.

The optoisolator of the FOD4218V utilizes the GaAs infrared LED to produce an infrared light beam, which then activates an internal SCR or Triac, whose load current is connected to the output. The infrared LED is driven by an external control voltage, which is rectified and regulated to bias the LED. When the LED conducts, it activates an internal SCR or Triac in the device, which then transfers the control voltage to the output.

The FOD4218V also has a built-in safety feature, which provides protection against an overload or short circuit. When the output current reaches 15mLs, the safety feature will disconnect the internal SCR or Triac, preventing damage and power loss. The output current can then be automatically re-established when the load current returns to normal levels.

The FOD4218V is a very popular choice for use in a variety of applications. It is a robust and reliable optoisolator device, which provides isolation for both AC and DC applications. It also offers flexible and accurate triggering capabilities and is able to handle up to 15mLs of output current. These features, combined with its affordability and ease of use make the FOD4218V an ideal choice for many different types of applications.

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