FOD420V

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Optoisolators are essential components with great electrical isolation used in switching circuits. Amongst them, the FOD420V series of optoisolators come under the Triac, SCR Output family. The components offer a wide range of features and specifications. In this article, we will focus on the FOD420V application field and working principle.

The FOD420V optoisolator series is mainly used in AC switching circuits and can be found in appliances and power supplies. It isolates the input and output circuit by using an infrared light emitting diode optically coupling with an integrated triac. The optoisolators also act as a reliable self-test switch functions for light and power load switching.

The FOD420V series contains a number of features and specifications. It comes in a hermetically sealed glass package, with a maximum RoHS compliance temperature rise. The optoisolator has a high isolation voltage of 4KV peak. It provides a wide range of power consumption choices ranging from (–10%) to (+90%) of the rated voltage and has a wide selection of choice for most general applications with off-state breakdown voltage from 600V to 4500V.

The optoisolator also has a low on-state voltage drop, which helps to improve efficiency. It is capable of operating in temperatures ranging from -25℃ to +70℃ for ambient environment and -30℃ to +85℃ for surface temperatures. The optoisolator also features good phase angle control characteristics with small variations in switching time over its broad range of off-state breakdown voltage. It also has a high isolation resistance between LED pin and output of 100MΩ minimum at 500V DC.

The working principle of the FOD420V optoisolator series is quite simple. When the input signal voltage reaches the breakdown voltage, the integrated Triac is triggered and it switches on. The Triac then controls the current flow. The LED in the optoisolator emits infrared light when the input voltage is applied, which is optically coupled with the integrated Triac and acts as a signal for the Triac to switch on.

The FOD420V series of optoisolators are a reliable and cost-effective solution to provide electrical isolation in switching circuits. Besides the wide range features and specifications it offers, its simple working principle makes it easy to use and can be used in many general applications.

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