6N139S

Optoisolators are a type of electrical component used to isolate one circuit from another. The 6N139S is an optoisolator with a transistor output (called a photovoltaic output), and is used for isolating circuit elements from one another or providing a physically isolated output when a signal is received. It can be used in a wide range of applications and is a popular device for its high speed switching capabilities.

Essentially, the 6N139S optoisolator is an integrated circuit composed of a photodiode, a light-emitting diode (LED) and an output transistor. When a voltage is applied to the LED, light is emitted, which is then detected by the photodiode. This action triggers the output transistor, which switches on and off in response. The system works on the principle of photovoltaic transport, which is a process whereby an electric field is generated by light, which causes electrons to move from one electrode to another.

The 6N139S optoisolator is a popular device because of its fast switching speed, which can be up to 1 million cycles per seconds. It also has a low forward voltage drop and a low on-state current, making it ideal for power circuits. The photovoltaic output of the 6N139S makes it suitable for use in industrial automation, medical equipment, and communications systems, where isolation between different components is required. In addition, the 6N139S can be used in a wide range of applications, including digital logic, power supply circuits, remote control circuits, and signal conditioning.

The 6N139S is also used in applications where the threshold voltage of the output transistor can be controlled. This threshold voltage is the amount of voltage that needs to be applied in order to trigger the output transistor. By adjusting this threshold voltage, it is possible to control the number of cycles per second that the output transistor can switch. This can be useful for applications that require a specific output frequency or waveform.

In addition to the traditional applications outlined above, the 6N139S can also be used to detect inputs from a variety of devices, such as thermocouples, thermistors, and pressure sensors. By wiring the 6N139S between the sensor and a circuit, the optoisolator can be used to detect changes in the signal level and switch the output transistor accordingly. This can greatly simplify the design of systems that require input from a large number of sensors.

Overall, the 6N139S optoisolator is a highly versatile device that can be used in a wide range of applications. Its photovoltaic output and fast switching speed make it ideally suited for industrial automation, medical equipment, communications systems, and other applications requiring isolated outputs. Its adjustable threshold voltage also makes it useful for creating specific output waveforms and frequencies. By taking advantage of all of these features, the 6N139S can be used to create a variety of useful circuits and systems.