4N28S(TA)-V

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Optoisolators are commonly used in electrical and electronic systems to provide electrical isolation between two circuits. They are particularly useful in situations where there are different operating voltages or components that share the same signal or power source. The 4N28S(TA)-V is a type of optoisolator that is made up of a photovoltaic output transistor, and this article will discuss its application field and working principle.

The 4N28S(TA)-V optoisolator is used in a wide range of applications, such as for signal transmission, controlling switching devices, and providing electrical isolation in circuits. It is also used to provide a form of electronic current limiting, as it prevents current flow from one circuit to another through the optoisolator. This can be useful when dealing with higher voltages, or when dealing with sensitive or hazardous materials.

The 4N28S(TA)-V optoisolator consists of a photovoltaic output transistor, which is essentially a semiconductor switch that consists of a diode and a transistor. When the light-sensitive diode is exposed to light, it creates a voltage across the base-emitter junction of the transistor, which then turns on almost instantaneously. This allows the transistor to act as a switch, and the current to flow between the collector and emitter connections. This current can be used to activate other circuits or allow signals to flow through the optoisolator.

The optoisolator also includes a number of protection features, such as a reverse-biased diode connected across the emitter-collector connection. This diode prevents any current from flowing backwards, meaning that the current can be safely transferred from one circuit to the other. The photovoltaic output transistor also provides a high level of electrical isolation between the input and the output circuits.

The 4N28S(TA)-V optoisolator is designed to operate between the power supply voltage and a minimum of 0.9V. It has a wide operating temperature range, from -40°C to 85°C and a wide input voltage range from 4V to 35V. It also has a maximum supply current of 2.7mA and a maximum output current of 25mA. The maximum power dissipation is 0.8W, and it has a forward voltage drop of 3.2V when the transistor is turned on. The optoisolator also has a low leakage current of less than 1µA. Finally, it has a wide response time of 20µs.

In conclusion, the 4N28S(TA)-V optoisolator is a highly useful device that can be used in a wide range of applications. It provides a form of electrical isolation between two circuits, and also has a number of beneficial protection features. Furthermore, it is designed to operate under a wide range of environmental conditions, making it an ideal choice for many applications.

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