PC823

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Optoisolators are electrical components used to provide galvanic isolation between two circuits in applications such as data transmission and conditioning. The PC823 is an optoisolator for data communications based on an infrared light-emitting diode (LED) and a phototransistor as transduction elements. The PC823 is one type of optoisolator with a transistor, photovoltaic output, designed specifically for data communication applications.

PC823 Application Fields

The PC823 is designed to isolate signals from noise and interference in applications such as signal conditioning, power line communication, and communications between industrial systems. It offers more than the required isolation to protect the sensitive microelectronic circuits from high voltage transients and short circuit currents. The PC823 is a popular optoisolator because it offers up to 200 volts of AC or DC input and output isolation, and its low cost makes it feasible to use it in large production volumes.

The PC823 is well suited for industrial use in applications such as industrial data transmission, audio noise suppressing, and signal isolation between processing circuits. It is also used in microcontroller and digital logic systems where protection against EMI and RFI need to be included.

PC823 Working Principle

The PC823 is a general-purpose optoisolator with a single channel. It contains a transistor, photovoltaic output, consists of an NPN silicon phototransistor optically coupled to a gallium arsenide infrared LED, along with a built-in resistor and other passive components that enhance its functioning. The LED emits infrared light when a forward voltage is applied to its anode. This light is directed at the phototransistor which is configured to be in an OFF mode. The light is absorbed by the phototransistor, which then turns ON and activates the circuit.

The optoisolator works by using the LED to transmit light that is absorbed by the phototransistor, which then conducts current to activate a circuit. When the input signal is removed, the LED no longer emits light and the phototransistor cannot detect the pulses and shuts down the output circuit.

The PC823 optoisolator is one of the most popular optoisolators used for data communication applications, due to its high speed response time, low power consumption, and high voltage isolation. It is a cost-effective solution and easy to use for a plethora of applications.

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