EL851S1(TA)

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Optocouplers are devices used in electronics to isolate two circuits. One of the most popular and well known optocouplers on the market is the EL851S1 (TA) Transistor Photovoltaic Output Optocoupler. This optocoupler is used mainly in switch mode power supplies, motor drivers, and inverters. Understanding the characteristics and operation of this optocoupler is key in understanding its application in electronic circuits.

The EL851S1 (TA) Optocoupler is a transistor output optocoupler which consists of an infrared emitting diode (LED) and a phototransistor put together in one package. The optocoupler acts as a signal modulator or switch. The LED emits an infrared light when energized by a current. When the lightbeam from the LED strikes the photosensor, the transistor is activated. This causes the collector-emitter current to increase thus turning the transistor on.

The EL851S1 (TA) output phototransistor has an open-collector output hence an external resistor is needed to connect the collector and the emitter if it is used in circuits that require an electromotive force (EMF). The external resistor in this case determines the amount of current that flows through the collector-emitter circuit.

The EL851S1 (TA) optocoupler can be used in a wide range of applications. As a signal modulator and switch it can be used in motor drivers, power supplies, and inverters. It can also be used to provide electrical isolation between two circuits. In this case the EL851S1 offers superior performance as compared to mechanical relays. In addition to this, the optocoupler can be used to generate RS-232 serial signals.

When it comes to working principle, the EL851S1 (TA) optocoupler works as a switch, signal modulator as well as optical isolator. In the ON state, current flows through the LED and the phototransistor when the external supplied voltage is applied. This results in the phototransistor turning on and current starts to flow the through the collector and the emitter. In the OFF state, the voltage supplied stops and current ceases to flow through the collector and emitter circuit.

In summary, the EL851S1 (TA) output phototransistor optocoupler is used mainly in switch mode power supplies, motor drivers and inverters. It is also used as a signal modulator and optical isolator in circuits. It consists of an infrared emitting diode (LED) and a phototransistor incorporated into one package. In its ON state current flows through the LED and the phototransistor. The EL851S1 is a great choice for those looking for a reliable and efficient optocoupler.

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