EL817(S)(A)(TB)

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The EL817(S)(A)(TB) optoisolator consists of a Gallium Arsenide infrared LED combined with an integrated photodetector and open collector transistor output, and its purpose is to prevent Voltages of different magnitudes and/or different grounding systems from interfering with each other. This optoisolator is commonly used in the commercial, industrial, automotive, and communication applications to provide galvanic isolation between a low-voltage signal source and a high-voltage output. It is available in both single- and dual-channel configurations, and it is designed to be isolated from either one of the two polarities, allowing it to connect two completely different systems on opposite poles.

In terms of operation, the optoisolator consists of a photodetector mounted on a printed circuit board and subject to an external electrical field. The photodetector then converts the incoming signal into an electrical signal, thereby providing galvanic isolation between the input circuit and the output circuit. The output signal is then amplified by an open collector transistor or FET, providing isolation from the input circuit to the output. This optoisolator can be used to link two circuits of different potentials without creating grounds loops or any other hazardous issues.

The EL817(S)(A)(TB) optoisolator is most commonly used as an input buffer of a microprocessor unit (MPU) for isolating noisy signals from the MPU, or as an output buffer for an optoisolator that is attacked to a drive unit. This optoisolator is also used in the safety interface and interlock applications for noise suppression. It can also be used as an LED driver for transmissive and reflective photoelectric sensors, digital pulse and optical tachometer drivers, and combination switches. It is also used in various applications where a degree of isolation is required, including automotive, communication, industrial control, EMI/RFI suppression, power line isolation, and motor control.

The EL817(S)(A)(TB) optoisolator is typically used in DC applications, but is also compatible with several AC applications as well. Its working principle is based on the basic principle of optical isolation, where an Infrared (IR) diode in the optoisolator will be used to detect an electrical signal and emit light photons in proportion to the input. The light photons will then be detected by an integrated phototransistor which generates an electrical signal equivalent to the input. This will then be amplified and converted into the required output signal. The optoisolator is highly reliable and provides Galvanic isolation from frequencies up to 5MHz, with some versions offering isolation from frequencies up to 10MHz.

In conclusion, the EL817(S)(A)(TB) optoisolator is a versatile and reliable component commonly used in many electronic systems and applications. It provides galvanic isolation between different circuits while preventing noisy signals from interfering with other circuit elements. It can be used in a variety of applications including automotive, communication, industrial control, EMI/RFI suppression, power line isolation, and motor control. Its working principle is based on the basic principle of optical isolation, where an Infrared (IR) diode in the optoisolator will be used to detect an electrical signal and emit light photons in proportion to the input.

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