6N135S(TB)

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Optoisolators are a form of electrical isolation component, that are used to protect one system from another, using an optically coupled beam of light to transfer a signal through an otherwise silent electronic barrier. One of the most common optoisolators in use today is the 6N135S (TB) Transistor, Photovoltaic Output. This type of optoisolator uses a light-emitting diode (LED) to activate an NPN transistor, which in turn can control larger loads.

Applications of the 6N135S (TB)

The 6N135S (TB) optoisolator is commonly used in all types of applications and systems, where an isolated switching signal needs to be transferred. This includes industries such as automotive, instrumentation, telecommunications, industrial automation, and medical equipment. It is also used widely in applications such as safety systems, power control, and voltage measurement, where clean switching signals must be transferred without interfering with the part of the system being monitored.

The 6N135S (TB) optoisolator can also be used in data transmission systems, where it can provide full digital signal isolation, limiting noise and interference even in electrostatic discharge (ESD) sensitive systems. In the case of certain systems, such as those that are in hazardous environments, this type of optoisolator is preferred over other isolation devices, as the optical isolation stop any electrical circuit from forming, effectively shielding both systems.

Working Principle of the 6N135S (TB)

The 6N135S (TB) optoisolator is made up of an Input-side LED, a Light-sensing Collector Diode (LSCD), an Output NPN Transistor, and a Photovoltaic (PV) element. When an input signal is applied to the LED, it will activate the diode, causing current to flow through the PV element. The voltage produced by the PV element will then activate the NPN transistor, allowing current from the output side to flow. By controlling the amount of current flowing through the LED, the amount of current flowing through the NPN transistor can be accurately regulated.

The 6N135S (TB) optoisolator is a fast switching device, with a response time between 500ns and 1μs, depending on the input signal. This makes the device ideal for applications with fast switching requirements, as it can react quickly to input voltage changes. This optoisolator also has high isolation voltage ratings, up to 3,750Vrms, allowing it to be used in harsh or hazardous conditions. As such, it is suitable for a number of low voltage applications, such as current sensors, and load switching.

Conclusion

The 6N135S (TB) optoisolator is a popular choice for electrical isolation between two systems or parts of a system. It is a robust and reliable device, with fast switching speeds and a high voltage isolation rating. This makes it ideal for applications that require protection from ESD and interference, such as safety systems, power control, and voltage measurement applications, as well as data transmission systems.

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