SFH6156-4T

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Optoisolators isolate one circuit from another electrically, while transmitting signals from one circuit to the other optically without any direct electrical connection. They run the electrical energy from an input circuit to an output circuit by providing a link between two types of energy. An optoisolator is a single package device composed of an infrared LED and a photodetector which can be a phototransistor, photovoltaic device, or photo diode. Each component is located on the same chip and not electrically connected to each other.SFH6156-4T is an optoisolator in the form of a four-terminal phototransistor device, offering excellent voltage isolation between the input and output circuits (up to 5000Vrms, Input-output). It is constructed by combining an infrared LED with a silicon phototransistor. It has a load current capability of 80mA, and when off it can withstand total input reverse voltage up to 30V.The most common application of SFH6156-4T optoisolator is for the implementation of a series current-limiting circuit. The input side is connected to the trigger signal source, such as a switch, and the output side is connected in series with the device to limit the current. When the switch is opened, a voltage will be generated that will in turn allow current to flow through the LED, causing it to light up. The phototransistors will detect this light, and generate a signal that will be transmitted to the output side, thus limiting the current.SFH6156-4T optoisolator can also be used in noise suppression circuits, particularly in hazardous areas. Here, it can be used to shield the input and output signals from electrical noise induced by other components in the system. The optoisolator will absorb the external noise and prevent it from interfering with the signal. Additionally, it can be used in low voltage systems for the transmission of digital signals, as it can provide a reliable, low-power and low-noise data transmission.The isolation capacity of the SFH6156-4T optoisolator is dependent on its built-in photovoltaic process. This process provides an additional path for the flow of current, which will bypass the LED and phototransistor, ensuring that electricity does not directly enter the output circuit. This isolates the two circuits from each other, providing electrical isolation and reducing the risk of electric shock.In conclusion, the SFH6156-4T optoisolator is an exceptional optoisolator with a high voltage isolation capability. Its built-in photovoltaic process makes it well-suited for a variety of applications, including noise suppression circuits, current-limiting circuits, and digital signal transmission. By combining an infrared LED, and a silicon phototransistor, the SFH6156-4T is an excellent tool for isolating two circuits from each other, while still providing reliable transmission of signals from one to another.

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