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Optoisolators - Logic Output

Optoisolators are used as a means of isolating digital signaling lines in order to prevent electrical surges, short circuits, or simply to minimize electrical noise from one circuit to another. A typical example of an optoisolator is the HCPL-7721-520E optoisolator, which is designed to provide electrical isolation between two digital logic output pins. This optoisolator contains a LED light emitting diode and an integrated photodetector, which together provide electrical isolation and allow simple digital logic to be transferred from one circuit to another.

HCPL-7721-520E Application Field

This HCPL-7721-520E optoisolator is designed for application in incredibly demanding environments where electrical isolation of digital logic output is required. With its hermetically sealed plastic package and ratings withstanding up to 3500 volts, this optoisolator offers reliable operation for a variety of applications. This optoisolator is suitable for use in industrial control systems, safety systems, automotive, and even aerospace technology.

HCPL-7721-520E Working Principle

As a typical optoisolator, the HCPL-7721-520E optoisolator works on the principle of electromagnetic radiation. Essentially, the input signal is converted to an optically transmitted signal by an LED light emitting diode. This light is then detected by an integrated photodetector, and this information is transmitted to the output pin. As a result, the output pin will process the logic states accordingly.

The LED light emitting diode requires a forward current of typically 5mA to operate correctly. This input current will be used to drive the LED and generate the optically transmitted signal. The output signal created can also be amplified, using the integrated photodetector, by user-defined gain levels.

In addition, this HCPL-7721-520E optoisolator utilizes a patented integrated monolithic photodetector design. This ensures that the output signal generated has a relatively high response speed (750kHz typical), making it suitable for high frequency digital logic.

Conclusion

The HCPL-7721-520E optoisolator is a great example of an optoisolator designed to be used in high performance applications. Its hermetically sealed plastic package ensures reliable operation in the most demanding environments, while the integrated LED and photodetector design allows for electrical isolation between two digital logic outputs. This optoisolator has a wide variety of applications, including industrial control systems, safety systems, automotive, and aerospace technology.

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