EL816(S)(Y)(TD)

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Optoisolators are electronic components that are designed to provide electrical isolation between two parts of a circuit while maintaining communication between them. This ensures that any noise or electrical spikes present on one side of the circuit do not transfer to the other, preventing any damage or disruption. The EL816 (S)(Y)(TD) is an example of a transistor-coupled photo-voltaic optoisolator, and this article will review its application fields and working principles.

Overview

The EL816 optoisolator is a 6-pin device with two pins dedicated to the input, two pins dedicated to the floating output and two pins dedicated to the power supply. It is typically used to provide electrical isolation between two different circuits or two parts of the same circuit, such as between a microcontroller and a motor, or between a controller board and a sensor. The device is a million-fold more resistant to electrical noise than a typical isolation transformer, making it an ideal choice for high-precision and low-noise applications.

Operating Principle

The EL816 optoisolator works on the principle of a light-sensitive transistor. When a current is passed through the input, it passes through an infrared LED within the device, which in turn emits a beam of light. This light is then detected by a photosensitive transistor within the device, which triggers a current through the output, thus providing electrical isolation between the input and output while allowing communication between the two. The EL816 optoisolator also features a built-in noise filter, which allows it to more effectively maintain signal integrity.

Applications

The EL816 optoisolator is used in a variety of applications to provide electrical isolation between two circuits or parts of a circuit. These applications include motor drives, data acquisition and control systems, process control systems, AC and DC current sensors, thermocouples, and pressure sensors. It can also be used to directly isolate the inputs of sensitive electronic components, such as microcontrollers and op-amps, from the outputs of higher voltage and electrically noisy devices, such as motors.

Conclusion

The EL816 optoisolator is a 6-pin, transistor-coupled photo-voltaic optoisolator that provides electrical isolation between two parts of a circuit or two different circuits while providing signal communication between them. It works on the principle of a light-sensitive transistor, in which current is passed through the input, triggering a current through the output, providing isolation between the two. It is typically used in motor drives, data acquisition and control systems, process control systems, AC and DC current sensors, thermocouples, and pressure sensors. The EL816 optoisolator is a million-fold more resistant to electrical noise than a typical isolation transformer, and features a built-in noise filter, making it an ideal choice for high-precision and low-noise applications.

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