EL817(B)

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EL817 (B) is a type of optoisolator manufactured by Sharp. An optoisolator or an opto-isolator is a device which creates a electrical separation between two interconnected circuits; it is also typically used to transfer data signals across a gap. EL817 (B) is part of the Transistor, Photovoltaic Output family of optoisolators, and therefore is mainly used to provide electrical isolation between two electrical circuits via the use of an electrical signal.

The device consists of a LED, a photodiode and a phototransistor as basic components and is suitable for use in digital and analog logic systems. Photodiodes respond to light while phototransistors perform switching operations. The optoisolator works by taking a small electric current for the LED to emit infrared light, which is then detected by a photodiode, thus initiating a larger current in the phototransistor. This is great for transmitting electrical signals across a gap which is not electrically isolated thereby preventing power or voltage spikes.

The EL817 (B) offers a number of advantages. For example, the LED and photodiode share the same package, making this optoisolator ideal for use in space-restricted panel-board assemblies. It also ensures fast response time and high isolation voltage up to 7000Vrms. Moreover, the costs involved in design and development is low which makes it one of the most cost-effective isolation technologies.

The EL817 (B) has applications in industries such as telecoms, automotive, aircraft avionics, industrial control, medical diagnostic, data conversion, and measurement applications. In the telecommunications sector, it can be used as a signal isolator in ISDN (Integrated Services Digital Network) protocol converters; it is also used to provide electrical isolation from dangerous ground loops in two-wire telecommunication lines.

The device can also be used in various other applications. It can be used to separate low-level power-supply systems from high-level logic systems and provide fault protection to the low-level systems from potential ground-fault conditions in the logic systems. It can also be used in amplifiers to provide input/output isolation. Additionally, it can be used in waveform generation and in voltage controller circuits.

In conclusion, the EL817 (B) optoisolator is a relatively simple yet powerful device. Its small size, low cost, and high isolation voltage make it an ideal choice for applications in many different industries. Moreover, its fast response time and good isolation properties make it a great choice for isolating signals in a variety of applications. If you are looking for an optoisolator-based device for your electrical application, then the EL817 (B) optoisolator is an excellent choice.

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