PS2801-1-L-A

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Optoisolators provide electrical insulation between two circuits by using light to transfer signals between them. They typically consist of an infrared LED (emitter) and an optically coupled semiconductor sensor such as a phototransistor, photo Darlington, or photocoupler, and are commonly referred to as photocouplers or opto-couplers. They are widely used in digital logic and mixed analog-digital systems, and are often used for isolation of high voltage AC power circuits from low voltage control circuits. The PS2801-1-L-A is a photocoupler, with the output being a transistor activated by a photovoltaic effect.

The PS2801-1-L-A consists of an infrared LED, optically coupled to an NPN silicon phototransistor in a 6-pin plastic package. The LED is powered with a DC voltage of 5V, with the maximum output current being 30mA. The phototransistor has a maximum current gain of 300 and a minimum collector current of 0.1mA. The optical coupling between the LED and phototransistor has a typical isolation voltage rating of 4kV.

The primary application field of the PS2801-1-L-A is for DC input to DC output isolation, as in digital logic, where it can provide immunity from transients in the input, while still providing a reliable signal from the output. It can also be used as an overvoltage protection device, as the optical coupling, in combination with a Zener diode, can provide a voltage clamp at the phototransistor\'s base, protecting the transistor from high voltage transients.

The working principle of the PS2801-1-L-A is based on the photovoltaic effect, whereby an electrical current is generated when light is incident on an optically sensitive material, such as a photoconductor or photoresistor. In the case of the PS2801-1-L-A, the LED is powered with DC voltage, emitting infrared light that is then incident on the phototransistor. This causes a current to flow in the phototransistor, which is then amplified by the current gain of the transistor, providing an output voltage.

The PS2801-1-L-A optoisolator provides a reliable electrical insulation between circuits, while still allowing signals to be transferred via optical coupling. It is commonly used in digital logic and high voltage AC power applications where the electrical safety of the equipment and the surrounding environment must be considered. The working principle of the device is based on the photovoltaic effect, whereby an electrical current is generated when light is incident on an optically sensitive material. This allows the device to effectively transfer signals from the input to the output in an electrically safe manner.

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