EL3H7(F)(EA)-G

Optoisolators, also known as optocouplers or photocouplers, are devices that provide electrical isolation between two systems, while allowing them to exchange data in form of electrical signals. EL3H7(F)(EA)-G is a type of transistor optoisolator, also called an opto-transistor. It provides electrical isolation between an input (the input side) and an output (the output side). Its primary application is for controlling and monitoring the powerline in isolation from it. The power line is input into the input side, and the output side provides a voltage to control and monitor the powerline.

EL3H7(F)(EA)-G optoisolator is a 4-pin device that requires a DC supply on its input side and provides an open-collector output, which requires an external pull-up resistor. Its three pins are designated as Input (IN), Collector (C), and Emitter (E). The fourth pin is the Vcc power supply pin. IN is the input side, C is the open-collector, and E is the input ground.

The working principle of this optoisolator is based on Photovoltaic effect, which is a phenomenon in which voltage is generated when light is incident on a p-n junction diode. It has a LED (light emitting diode) which is used to detect the input signal and a phototransistor which is used to provide isolation between the input and output side. When the input is high, the LED glows and generates a small amount of current, which is then used to forward bias the phototransistor and turn it on. This in turn conducts the input from the input side to the output side, providing the output in the form of a DC voltage. The output will remain in its high state until the current in the LED decreases due to the decrease in input.

EL3H7(F)(EA)-G optoisolator is used in isolation applications such as power control, inverters, silicon controlled rectifiers (SCR), motor control, dimmers, etc. It is also used in test jigs and instrumentation for electrical isolation. Moreover, it is used in automation systems for monitoring and control of AC and DC loads. Due to its reliable, isolated, and low-cost nature, it has been employed in various other applications like industrial, communications, consumer, automotive, etc.

The voltage range of the output is between 1V to 35V for a forward current of 2mA. The maximum DC input voltage can range from 3V to 50V. The output current is guaranteed to be up to 200mA. It is also important to note that the output is not voltage regulated, providing a linear current except for the saturation voltage. Its maximum junction temperature rating varies from -55°C to +100°C.

In conclusion, EL3H7(F)(EA)-G optoisolator is a basic 4-pin device that is used mainly for providing electrical isolation between two sides. It works on the principle of photovoltaic effect and is used in applications such as power control, inverters, SCR, motor control, dimmers, etc. It is also used in test jigs and instrumentation for electrical isolation.