EL817(M)-G

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Optoisolators are devices used for isolation of high voltage circuits like AC power lines by using light. They are used to isolate the input signal from the output while providing the expected electrical control. Barrier optoisolators, also called optical couplers, consist of a light emitting diode (LED) and a light dependent resistor (LDR). The EL817(M)-G is a type of optoisolator, which is a transistor, photovoltaic output device.

The EL817(M)-G optoisolator consists of a LED mounted in a four-pin package along with an output photovoltaic Darlington transistor. The device is sensitive to visible and infrared light, so it can be triggered by any light source emitting either wavelength. The light striking the LED is converted into electrical energy by photo-voltaic effect. This electrical energy is then used to activate the output photovoltaic Darlington transistor, which then supplies current to the circuit.

The working principle of EL817(M)-G optoisolator is based on an input signal, which, when applied to the LED, sets off a light signal. This light signal is then received by the photovoltaic Darlington transistor and converted to electrical energy, inducing a current flow in the output circuit.

The applications of EL817(M)-G optoisolator are found in temperature and pressure sensors, counting systems, digital to analog converters, automotive controllers, relays, etc. They are used as switches for controlling AC and DC circuits. They can also be used for controlling audible alarms, doorbells, and other security systems.

EL817(M)-G optoisolator offers a lot of advantages over other types of optoisolators. Firstly, it is immune to most environmental noise and electrical interference. Secondly, the parasitic capacitance and inductance values are low, thus providing better performance. Thirdly, it offers robustness and long-term reliability, as the LED and photovoltaic Darlington transistor are housed in a single package. Finally, it provides isolation of up to 4 kV between the input and output circuits.

In conclusion, the EL817(M)-G optoisolator is a useful device employed in a variety of applications, due to its advantages over other types of optoisolators. It provides isolation between the input and output circuits while also being immune to most environmental noise or electrical interference. The device has a variety of applications ranging from temperature and pressure sensors to relays and automotive controllers.

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