EL817(S1)(D)(TD)

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The EL817 (S1)(D)(TD) optocoupler is an optoisolator device belonging to the type Transistor, Photovoltaic Output. This optocoupler is a current-transfer device that allows very efficient protection of the power stage in applications such as dimmers, AC and DC motor drives, audio amplifiers and industrial control systems, among others.

An optocoupler is a device that provides galvanic isolation of signal or power from input to output. It consists of an emitter, which is an LED, and a detector, which is a phototransistor, which consist of an optical set with all the insulating properties so that a voltage between the input and output of the optocoupler can be maintained without current flow between the two points.

The EL817 (S1)(D)(TD) optocoupler consists of an infrared LED that emits a light beam, modulated by an AC or DC current, and a phototransistor or detector that receives the light. The LED and the phototransistor are separated by a transparent material, which isolates the two parts electrically. The separation of the two parts allows it to be stable in systems that are subjected to electrical noise and attempts to reverse the voltage.

The maximum current that the EL817 (S1)(D)(TD) can handle is 150 mA and the maximum allowable voltage is 20V. This optocoupler has a total load capacitance of 4.5pF and an LEDctrl current of 8mA. In addition, it has a response time of 2.5μs for 1-10% (rise) and 4.5μsfor 90-10% (fall). These features make this optocoupler versatile and suitable for a wide range of applications.

The EL817 (S1)(D)(TD) is mainly used in applications where the optical isolation of the signal is required, for example, to protect the power stage from electrical noise or other unwelcome electrical signals. This is very useful when it is used in motor control or audio amplification systems, where a clean and distortion-free signal is required. Also, this optocoupler can be used in dimmers, industrial control systems and other similar applications.

Its working principle is simple and, in practice, based on the ability of an LED to emit a light beam when a current is applied to it. This light beam is received by the phototransistor, which produces an electric current that will be proportional to the current produced in the LED. Thus, a current applied to the EL817 (S1)(D)(TD) is converted into an electrical current, allowing it to be used in a wide variety of applications.

In short, the EL817 (S1)(D)(TD) is an optocoupler of the type Transistor, Photovoltaic Output, which is mainly used in applications where the optical isolation of the signal is required. It has a maximum current of 150 mA, a total load capacitance of 4.5pF and an LEDctrl current of 8mA. Its working principle is based on the ability of an LED to emit a light beam when a current is applied, which is received by the phototransistor, producing an electrical current proportional to the current produced in the LED.

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