4N35S1(TB)

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Optoisolators - Transistor, Photovoltaic Output are most widely used in controlling and data communication applications, as they offer a way to transmit data without electrical connections between signal sources and signal receivers by using light as the medium for the transmission. The 4N35S1(TB) is an example of a photovoltaic optoisolator, a device used to isolate circuit sections from one another by using a light emitting diode (LED) and a photovoltaic cell.  These optoisolators have been designed with excellent safety characteristics and compliance with safety standards such as UL/CSA.

Application Field

The application field for the 4N35S1(TB) optoisolator is varied and comprehensive, spanning industrial, military, medical, automotive, and aerospace use. Industrial uses include motor and contactor control, power supply control, and sensing applications. In the military, photovoltaic optoisolators are typically used for missile launch control and defense systems. In medical applications, they are used in manufacturing diagnostic testers and other medical devices. In the automotive and aerospace world, they are used to monitor and control systems such as engine speed and fuel level.

Working Principle

The 4N35S1(TB) optoisolator consists of an LED and a photovoltaic cell, both housed in an insulated package, and connected internally. The LED is typically driven by an external voltage source, and produces photons that are absorbed by the photovoltaic cell. This absorption causes an increase in the voltage potential across the photovoltaic cell, which can then be used to turn on a connected transistor or other logic IC.

In addition, the optoisolator can be configured to use an external current source instead of a voltage source. This arrangement allows progressive control of the current through the LED, allowing for a greater range of potential applications.

The optoisolator can also be used to transmit digital data by modulating the current that passes through the LED using a logic signal. The optoisolator can be used in an environment where sensitive components are connected to devices that may produce complex voltage spikes due to high-power circuit components, such as motors, relays, or switches. Since the current passing through the LED is typically low, it can prevent damage to the sensitive components from voltage spikes that may occur in the other devices.

The 4N35S1(TB) is an extremely useful optoisolator, due to its wide variety of applications and its safety characteristics. It provides a safe and efficient way to control and transmit data over any environment, especially ones where the potential for voltage spikes is high. With its broad range of uses, it is an essential device for any number of applications.

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