6N138

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Optoisolators are a useful type of optoelectronic device that are used to provide electrical isolation between two circuits or systems without the need for wires. The 6N138 optoisolator is an example of a transistor, photovoltaic output optoisolator, which can provide isolation between two systems with electrical and magnetic immunity. This makes it suitable for applications where an electrical connection between components may be dangerous or undesirable, such as in medical or hazardous environment.

The 6N138 is a 4-pin optoisolator in a dual-in-line (DIP) package. It consists of an infrared emitting diode (IRED), a NPN bipolar phototransistor, and two galvanic isolation barriers. The IRED is an LED that emits infrared light when current is applied to it, which then strikes the photosensitive transistor. The transistor current gain is proportional to the current applied to the diode, so the optoisolator can be used to pass signal information from an input circuit to an output circuit.

The 6N138 optoisolator is particularly useful in applications requiring electrical isolation and a high degree of accuracy in signal transmission. As the LED and the phototransistor are optically isolated, they are not connected to each other via any wires, so no additional electrical noise is added to the signal. With its high degree of accuracy, the 6N138 is suitable for use in applications such as air quality monitoring systems, where precise measurements over a large range are required. Additionally, with its wide operating temperature range of -40°C to +85°C, the 6N138 is suitable for use in industrial and automotive applications.

The 6N138 optoisolator also offers improved electromagnetic interference protection, which is useful for applications that require protection from high levels of electromagnetic radiation. The galvanic isolation barriers saturate the signal quickly, preventing the signal from entering or crossing any input boundary conditions, and thus protecting the output from interference. This makes the optoisolator ideal for noisy environments, where other methods of signal transmission may not be suitable.

In conclusion, the 6N138 optoisolator offers reliable electrical isolation, a high degree of accuracy, and improved electromagnetic interference protection for applications in which electrical connection is either not possible or undesirable. With its wide operating temperature range and low input current requirements, the 6N138 is a popular choice for use in industrial and automotive applications.

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