4N373SD

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Optoisolators, also known as optocouplers and opto-isolators, are devices that electrically isolate two circuits by using light. The 4N373SD is a type of optoisolator that utilizes a transistor and photovoltaic output. It is commonly used in industrial and military applications, as well as other applications that require specific levels of electrical isolation.

Overview

The 4N373SD is a two-channel optoisolator that contains two integrated circuits separated by a transparent isolation wall. It consists of a light emitting diode (LED) on one side and a photo sensitive receiver on the other side. This configuration allows both the input and output signals to be completely isolated.

Application Field

The main application of the 4N373SD is for electrical isolation between two seperate electronic circuits. This optoisolator is commonly used in high-voltage environments such as medical diagnostics, railway locomotives, and military applications.

The 4N373SD can also be used in audio applications such as audio signal transmission in a studio environment. The optoisolator is used to optically isolate the recording equipment from the sensitive microphones and other input sources, thereby eliminating any potential electrical noise interference.

The optoisolator can also be used in motor control circuit applications such as the control of DC motors. This type of circuit requires electrical isolation between the input and output sides to prevent damage.

Working Principle

The 4N373SD optoisolator consists of two integrated circuits: the input side and the output side. On the input side is a light emitting diode (LED) that emits light when an input voltage is applied to it. The light then passes through the transparent isolation wall to the output side of the optoisolator, which contains a photo sensitive receiver.

The photo receiver translates the incoming light signal into an electrical current that is then output on the other side. This output current is used to control the load, which can be anything from a DC motor to an audio signal.

The optoisolator also provides electrical isolation between the two circuits, which prevents any electrical signals or currents from crossing over to the other side. This means that the load is completely isolated from any electrical interference or disruption.

Conclusion

The 4N373SD optoisolator offers electrical isolation between two circuits, allowing them to communicate without any interference. It is commonly used in industrial and military applications, as well as audio and motor control applications due to its reliable performance and high-temperature tolerance. By understanding the working principle behind the 4N373SD optoisolator and its application fields, engineers can easily find a suitable optoisolator for their project.

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