PC853X

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Optoisolators are photorelays in which the energy of light is used to switch an electronic circuit in a non-contact manner. These devices are mainly used to isolate a low voltage circuit from a high voltage one to prevent shock dangers as well as to reduce EMI and RFI interference. The PC853X series of optoisolators from Avago Technologies incorporate a gallium arsenide infrared emitting diode and a transistor output, providing a high current transfer ratio over an isolation of 3750 Vrms. This series is designed to provide an isolation solution for an input voltage up to 24 V and an output voltage up to 250 V. The PC853X series offers a wide variety of applications in varying fields due to its capability to match the desired parameters of each application.

The optoisolator’s construction includes an LED connected to a Darlington type photocoupler IC that contains two NPN transistors in a lighttight enclosure. The collector of one transistor is connected to the collector of the other, forming a Darlington configuration. The output side of the optoisolator consists of a single NPN or PNP transistor with an emitter connected directly to ground. The collector is connected to a voltage source, typically higher than the output voltage of the circuit connected to the input side. When triggered by the LED, the transistor on the output side of the optoisolator switches off, and the connected circuit accordingly switches off. In the off state, the input voltage is isolated from the output voltage.

One of the main advantages of PC853X optoisolators is low operating current; they are designed to work with currents down to 10 mA, making them suitable for a wide range of applications where low current is required. Additionally, the PC853X series features a high conductor/insulator resistance and optical breakdown strength. Furthermore, the devices boast a long life span of over 1 million operations, making them reliable and durable. In addition, they are capable of operating in any environment, with a temperature range of -40°C to +85°C.

PC853X series optoisolators can be found in a variety of applications wherever electrical isolation is needed. These optoisolators are commonly found in industrial applications including motor speed control, dimmer controls, and remote control applications. Additionally, optoisolators are used in communications systems such as telephones, modems, and fax machines. Other applications include consumer electronics products such as remote controls, automotive systems, and various medical device circuits.

In conclusion, PC853X series optoisolators from Avago Technologies provide a reliable electrical isolation solution for a variety of applications. They are capable of providing isolation up to 3750 Vrms, and are designed to handle currents down to 10 mA. Additionally, the devices feature a long life span and are capable of operating in temperatures from -40°C to +85°C. PC853X optoisolators are ideal for motor speed control, dimmer controls, remote control, communication systems, consumer electronics, automotive systems, and various medical device circuits.

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