EL354(A)(TB)

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Optoisolators are electrical devices which provide electrical isolation between a control circuit and a separate circuit it is controlling. The EL354 optoisolator belongs to a specific type of optoisolator know as the Transistor, Photovoltaic Output. This type of optoisolator is used when galvanic isolation is needed and when signals usually exceed the voltage limits of the circuitry. The following will discuss the application fields of the EL354 and the working principle.

The EL354’s application fields include instrumentation, security systems, measurement electronics, data transmission systems, computers, medical electronics, and power systems. In instrumentation, the optoisolator can provide unique ratiometric, linear, or curve-setting outputs for such devices as position actuators, transducers, controllers, and feedback elements. For security systems the EL354 provides output sensitivities to monitor various voltage levels. Then, in measurement electronics, the optoisolator provides switching points that are independent of the power supply voltage and are adjustable in different ways. It also may be used in data transmission systems and computers to perform logical functions and to selectively switch between bits.

The EL354 also can be used in medical electronics where demands are high on its reliable functioning. It can provide accurate, reproducible data outputs for critical parameters such as those found in medical diagnostic and therapeutic instruments. Further, the optoisolator is used in power systems to isolate low-level inputs and outputs from high voltage and currents typically found in power distribution systems. Beyond these application fields, the EL354 can be used in a wide variety of other applications where galvanic isolation is required.

The working principle of the EL354 is fairly simple. Essentially, it is composed of two parts: an optoelectronic component and a output switching component. The optoelectronic transducer, as the name implies, is an optically coupled component which is responsible for transferring electrical signals with no physical electrical connection. Power for operation of optoelectronic transducer is typically supplied by an external source or it is integrated in the physical package of the EL354. The output switching component is a three-terminal switching transistor which is used to guarantee logic level isolation, which is typically around 1000 volts DC.

The use of the optoisolator in this type of optoisolator is to reduce the effect of external noise on sensitive control signals. When a signal is generated or received from a given circuit, it is optically coupled with the output switching component which changes its state based on the transmitted optical signal. This change in the input state is transmitted to the output switching component, allowing the optoisolator to isolate the signals between two different system circuits. The optoisolator thus provides a physically isolated gate which can protect the circuits and the delicate electrical signals.

In conclusion, the EL354 optoisolator is a versatile optoelectronic device used for the purpose of electrical isolation. Its particular type of optoisolator, the Transistor, Photovoltaic Output, is used to transfer electrical signals with no physical electrical connection and to isolate low-level inputs and outputs from high voltage and currents. The working principle is simple and allows for the electrical isolation and protection of sensitive control signals. The EL354 is a useful device which can be applied in a wide variety of applications such as instrumentation, security systems, measurement electronics, data transmission systems, computers, medical electronics, and power systems.

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