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Optoisolators - Transistor, Photovoltaic Output

Introduction

The 4N35SM optoisolator is a off the shelf option for a variety of industrial applications due to its rugged construction and its value for money. In the following paragraphs, the operating principle and its most common application fields will be summarized.

Working Principle

The 4N35SM optoisolator is a 4-pin device which features a plastic package with a light-sensitive LED (input) and a NPN transistor (the output). As it is an optoisolator, it utilizes photovoltaic principles to isolate the input and output circuits. The input LED emits light when electric current passes through it. The light from the LED is then captured by the photodiode and converted to an electrical voltage. This voltage is then used to generate a current which drives the base of the output transistor to turn on, thus supplying power to the output.

Applications

Due to its wide range of features and its ease of setup, the 4N35SM is suitable for a variety of fields. The most common applications are as follows:

• High Voltage Applications: The 4N35SM can be used in high voltage applications such as Motor Control, Variable Frequency Drives and AC Power Regulation, due to its ability to withstand large input and output voltages.
• Communication Circuits: The optoisolator is ideal for communication circuits, such as modems, which require reliable data transmissions at higher frequencies.
• High-Speed Switching: Thanks to its fast switching speeds, the 4N35SM can be used in applications in which fast responses are required such as motion control and robotics.
• Industrial Automation: This optoisolator is particularly suitable for industrial automation applications due to its high input and output voltages, its fast switching speed, its small size, and its low cost.

Conclusion

In conclusion, the 4N35SM is a versatile optoisolator which can be used for a variety of applications. It is well suited to high voltage applications due to its robust construction and its ability to withstand large input and output voltages. Furthermore, its fast switching speeds mean it is also suitable for applications such as high-speed switching and industrial automation.

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