6N138-X007T

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Optoisolators - Transistor, Photovoltaic Output are devices designed to provide electrical isolation between two circuits. The 6N138-X007T is a photovoltaic optoisolator, which incorporates both a photocell and an open-collector NPN type output transistor. The primary application field of the 6N138-X007T is isolation between low-voltage electrical circuits, used in a variety of digital electrical and electronic devices.

The 6N138-X007T acts as signal transmission between two different circuits, allowing reliable logic level communication, while maintaining electrical isolation between the two circuits. This is achieved by a light-activated process, which begins with photocell receiving an input signal; in turn, the photocell emits light through an LED to the photovoltaic cell.

The photovoltaic cell then triggers a light-induced current flow, which is regulated by the output transistor resulting in the optoisolator transmitting a logical signal at its output pin. The 6N138-X007T optoisolator provides a common collector open-collector type output, meaning the output collector is kept at a low potential, until the transistor is activated and the output is triggered.

When the 6N138-X007T is used with a diode, some additional characteristics can be achieved. By connecting a diode across the LED within the device (an LED-diode bridge) the low-voltage switching threshold of the optoisolator is reduced. This is useful, as the diode will enable the 6N138-X007T to trigger its output transistor from many more voltage levels.

The 6N138-X007T is typically used with a voltage supply in the range of 5-30V, with the input current to the photocell beginning from a very low level of 10µA. The LED used within the optoisolator should be driven with a forward current of 4-20mA; this is usually determined by setting the output current to the maximum forward current rating of the LED.

The typical response time of the 6N138-X007T is on the order of 50µs, making it suitable for digital and analog signals, as well as microprocessor-based applications. The 6N138-X007T can be used in a variety of circuits, such as low-side switches, output drivers and many other isolation applications.

In summary, the 6N138-X007T consists of a photocell, which triggers an LED that is connected to a photovoltaic cell, resulting in a logic-level output. This output is regulated by the output transistor, providing isolation between two circuits. In addition, a diode can be added for the purpose of reducing the low-voltage switching threshold of the optoisolator. The 6N138-X007T is typically used in a variety of circuits, as its typical response time is on the order of 50µs.

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