4N26S Isolators

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Optoisolators, also known as optocouplers, are devices that use infrared light-emitting diodes (LEDs) to isolate two circuits from each other. They are designed to prevent noise and transients from passing between two or more electrical circuits, while allowing voltage, current, and digital signals to pass between them. The 4N26S optoisolator is an integrated device that contains a LED, a phototransistor, and a base resistor in one package. It is commonly used in various types of industrial systems, communication systems, automotive electronics, and other applications that require electrical isolation.

Application Field

The 4N26S optoisolator is used in a wide range of applications, including industrial automation systems, pulse signal detection, communications equipment, automotive electronics, and consumer electronics. These devices are typically used in applications where noise immunity and high speed are required. In these applications, the 4N26S provides electrical isolation between two circuits, along with precise high-speed signal sensing and transfer.

Working Principle

The 4N26S uses an LED that emits infrared light when a voltage is applied across its terminals. This light is then detected by the phototransistor, which is sensitive to infrared light. When the LED emits light, the phototransistor begins to conduct current. The amount of current that the phototransistor can pass depends on the amount of light that is being emitted. The base resistor limits the amount of current that the phototransistor can pass.

The 4N26S optoisolator provides electrical isolation between two circuits, while allowing signals to be transferred between them. The LED is connected to one circuit, while the phototransistor is connected to the other. When the LED emits a light, the phototransistor detects the light and passes a current signal to the second circuit. This allows the two circuits to remain isolated, while still allowing a voltage signal to be transferred between them.

The 4N26S optoisolator is an essential component in a wide range of applications. It provides electrical isolation between two circuits, while still allowing signals to be transferred between them. In addition, it provides noise immunity, high speed, and precise signal sensing. This makes the 4N26S a versatile and reliable optoisolator for various industrial, automotive, and consumer electronics applications.

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