6N139V

Optoisolators are components that use both electrical and optical-based signals to provide electrical isolation between two circuits, allowing danger due to short-circuiting or electrostatic discharge to be eliminated. One of the most commonly used optoisolator components is the 6N139V, which belongs to the category of transistor-photovoltaic output optoisolators.

The 6N139 is a 6-pin optoisolator designed for use in various applications. It comprises a gallium arsenide infrared LED, also known as an emitting diode, and an NPN silicon phototransistor detector. The device is encased in a 6-pin dual-in-line package and operates on a supply voltage of up to 30V. The optoisolator also has a maximum continuous output current of 20mA.

The LED in the 6N139V optoisolator emits light beams when a voltage is applied from the output current loop and it hits the phototransistor detector. This detector triggers an electrical current by converting the optical energy to electrical energy. This current loop can be used to trigger a circuit, for example, a Darlington transistor array or a logic circuit.

The working principle of the 6N139V optoisolator is as follows. When there is no input signal, the LED sensor emits no infrared light. As a result, the phototransistor does not detect the light and no current may flow through the output pin of the device. When an input signal is received, the LED is triggered and emits an infrared light which, in turn, triggers the phototransistor. This leads to conduction of current across the output pin, which completes the circuit.

The circuit design of the 6N139V optoisolator makes it very useful for applications such as switching of signal relays, triggering of alarm systems and detecting of presence and/or absence of objects. It can also be used for isolating signals from neighboring circuits as a safety precaution. The device is not only used in commercial and industrial applications, but also for academic and hobbyist projects.

In conclusion, the 6N139V optoisolator is a very useful device that belongs to the category of transistor-photovoltaic output optoisolators. It is used for switching of signal relays, triggering of alarm systems and detecting of presence/absence of objects, and is also useful for isolating signals from neighboring circuits. The optoisolator works on the principle of infrared LED being triggered by an input signal, converting the light energy to electrical energy which is then emitted from the output pin to complete the circuit.