4N35S

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Optoisolators are component devices that are used to provide electrical isolation between two sections of an electric circuit. They are comprised of a light source, normally an infrared diode or LED, and an output device, often a phototransistor. An optoisolator could be considered a digital or analog switch if the output device can turn on an electrical path, or a detector if it can detect the amount of light emitted from the source.

The 4N35S optoisolator is an example of a transistor-based optoisolator. It is composed of a gallium arsenide infrared LED emitting a wavelength of 875nm, and an NPN phototransistor for the output device. The 4N35S has a peak sensitivity of 880nm, with a modulation frequency response of 500Hz when operated in linear mode, and a maximum switching frequency of 4kHz. It is available in a 6-pin Dual-in-Line (DIL) package.

The 4N35S application field includes industrial equipment, automotive systems, medical monitoring devices, alarm systems, and communications systems. Its working principle is based on the photo-sensitivity of the phototransistor component, meaning that the LED source emits photons that are collected and converted into electrical signals by the phototransistor. This allows the optoisolator to provide optical isolation between two sections of an electronic circuit.

The electrical isolation provided by the 4N35S is critical for preventing malfunctioning of sensitive electronic components due to component failure or power spikes. Furthermore, optoisolators can prevent interference from external signals from affecting the circuit. This is especially important in systems where varying input levels must be converted into digital signals or other signal types.

An additional advantage of the 4N35S optoisolator is its ability to act as a voltage limiter on the input side. This is because the LED source has a very low voltage rating, which stops the input signal from exceeding the maximum voltage level of the phototransistor. This helps to protect the circuit from dangerous voltage levels that could otherwise permanently damage sensitive components or cause fires.

The 4N35S optoisolator is an effective and versatile component for providing electrical isolation and protection against voltage overloads, interference, and component failure. Its components are reliable and robust, and its peak sensitivity allows it to achieve a modulation frequency response of up to 4kHz. This combination of features makes the 4N35S applicable in a wide variety of industrial, automotive, medical, alarm, and communications systems.

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