EL817(S)(B)(TD)

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Optoisolators, also known as photocouplers, optocouplers and optical couplers, are components used in electrical circuits for isolating and connecting two circuits. EL817 series optoisolators are single-channel, transistor, photovoltaic output devices. These optoisolators can be used for switching, logic input, and output signals in a variety of applications.

The EL817 optoisolator consists of a gallium arsenide infrared LED optically coupled to a silicon phototransistor. The LED light output, when driven from an external power source, can actuate the phototransistor switch. The output current of the phototransistor can also be collected for sensing. The EL817 optoisolator typically switches from an \'on\' to \'off\' state with a minimum LED input current of 5mA.

The EL817 optoisolator has three pins: the anode of the LED (pin 1), the collector of the NPN phototransistor (pin 2) and the emitter of the phototransistor (pin 3). When an external electrical current is applied to the LED, the LED emits infrared light. This light is then detected by the phototransistor, which switches the transistor on. This in turn causes current to flow through the optocoupler and the output to switch to the ‘on’ state.

The EL817 optoisolator has a variety of uses, some of which include isolating noisy power lines from logic circuits, protecting sensitive logic circuits from voltage and current spikes, and providing a secure connection between circuits. It can also be used for switching logic signals in digital logic circuits, such as logic gates, timers, and counters.

The EL817 optoisolator is ideal for interfacing between analog and digital systems, such as between a microcontroller and a logic circuit. It can be used to drive logic levels across multiple voltage levels, such as between +12V and +5V. The EL817 optoisolator can also be used to protect logic circuits from noise or voltage spikes, as well as for isolating a noisy power supply from a circuit that requires clean power.

The EL817 optoisolator is an ideal choice for applications requiring a low cost, compact, and reliable optoisolator. Its small size and low-power requirements make it well suited for applications in which space is limited or where power consumption is a factor. The optoisolator provides fast switching time, low current requirements, and good isolation for high-speed digital logic circuits. Its ability to switch logic levels across multiple voltage levels makes it ideal for interfacing between analog and digital systems.

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