PC817X3

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PC817X3 is a kind of Optoisolator / Transistor, Photovoltaic Output, which has an optically-coupled input and a photovoltaic output section. PC817X3 protects systems from noise and signals distortions by electrically isolating the input side from the output side. The PC817X3 is composed of a gallium arsenide infrared-emitting diode (IRED) and an output phototransistor built on one chip.

An important feature to notice about the PC817X3 are the low working voltage from 2.7V to 5.5V, wide variety of package styles and high isolation voltage up to 5 kV. As a transistor, photovoltaic output optoisolator, the PC817X3 provides a transfer ratio of 100mV maximum and a low current transfer ratio of 6.4mA maximum. The rise time and fall time are typically 10μs maximum and the direct current transfer ratio is 200% maximum.

The applications of PC817X3 are primarily for use in industrial systems, including device Programmable Logic Controllers (PLCs), relays, and other embedded systems. PC817X3 can be used to integrate, control, and protect signals in these systems. It can handle high-frequency signals, operating for long periods of time with reliable switching performance. PC817X3 is also used in medical equipment for monitoring medical gas systems, central control, and safety facilities. It is suitable for monitoring systems that keep watch for emergency signals, fault signals, and communication signals.

The working principle of PC817X3 is based on the concept of converting light into electricity. A gallium arsenide infrared-emitting diode (IRED) is used to generate light when electrical current is applied to the input. This light is then captured and converted into electricity by a phototransistor when it passes through it. The electricity generated is what opens or closes the output on PC817X3, providing the necessary isolation between the input and output.

In conclusion, the PC817X3 optoisolator / transistor, photovoltaic output is designed for modern industrial control systems, providing high performance, while having a low working voltage, wide variety of packages, and a 5 kV isolation voltage. The working principle of PC817X3 relies on the concept of converting light into electricity, with a gallium arsenide infrared-emitting diode (IRED) and a phototransistor used to generate the light and capture and convert it into electricity.

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