PC357N4 Isolators

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Optoisolators are used in electronic systems to isolate signals electrically and optically to prevent interference. The PC357N4 is a very versatile optoisolator that can be used in a variety of applications requiring electrical isolation. It consists of a Transistor Output Optocoupler with a Photovoltaic Output Section. The main application fields and working principle of the PC357N4 are as follows.

Application Fields of PC357N4

The PC357N4 is most often used to provide electrical isolation of input signals in order to protect load circuitry from dangerous voltages coming from the source. Additionally, its photovoltaic output section can be used to measure power outputs and convert them to an analog output signal. As a result, the PC357N4 can also be used in power supply overvoltage and undervoltage protection, over-current protection, motor control, and other applications.

Working Principle of PC357N4

The PC357N4 is a combination of a Transistor Output Optocoupler (PC325) and a Photovoltaic Output Section (PC336). The PC325 is a 4-pin optocoupler with a LED inside. The LED is driven by the input signal, and the Transistor Output optocoupler enables the input signal to be transmitted through an isolated path to the output circuit.

The PC336 is an integrated phototransistor optocoupler with a photovoltaic output section. Under the pulse drive of the PC325 LED, the photovoltaic section of the PC336 outputs a power output signal in form of a current. The output current of the PC336 is then fed into an external circuit to monitor the power output from the input signal.

Conclusion

The PC357N4 is a combination of PC325 and PC336 optocouplers. It is used for electrical isolation for protecting load circuitry from dangerous voltages, as well as for power supply overvoltage and undervoltage protection, over-current protection, motor control, and other applications. The PC325 enables signal transmission through an isolated path, and the PC336 measures power outputs and conveys them to an analog output signal.

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