4N27W

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Optoisolators are designed to provide electrical isolation between the input and output of an electrical system. This prevents high voltage spikes and potential noise coupling from reaching the system, protecting sensitive components or other systems on the same circuit. The 4N27W Optoisolator is a transistor-photovoltaic output device that is ideal for high speed switching and integration into systems. This article will discuss the application field and working principles of the 4N27W Optoisolator.

Application Field

The 4N27W Optoisolator is an ideal solution for high speed switching of signals between two different circuits. It is designed for switching a signal from one circuit to another without electrical coupling between the two. This allows it to switch signals quickly without the possibility of damaging components, or the high frequency noise that can be caused by a direct electrical connection. The 4N27W also makes a great choice for isolating logic signals with isolation characteristics up to 4 kV/µs.

The 4N27W Optoisolator is also designed to have low power consumption and a wide operating temperature range. This makes it ideal for applications that need to operate in extreme temperatures, or under varying loads. Additionally, the 4N27W has an open-collector output, which is ideal for applications that require an open-collector compatible input.

Finally, the 4N27W Optoisolator is also ideal for use in medical equipment, where it can provide isolation from potentially dangerous voltages and ensure that the patient is not exposed to an increased risk of electric shock.

Working Principle

The 4N27W Optoisolator works by using a photovoltaic (PV) cell to switch a signal from one circuit to another without electrical coupling. The PV cell consists of a junction of two distinct types of semiconductors, one of which absorbs light and creates energetic electrons. When the PV cell is exposed to a specific wavelength of light, the other semiconductor absorbs the energy and gives off electrons. This generates a voltage that is sent to the transistor, which amplifies the voltage and switches the signal from one circuit to another.

The 4N27W Optoisolator also utilizes an open-collector output configuration. An open-collector output is wired in such a way that the transistor is either saturated or completely off when the input signal is applied. This means that the collector voltage is not inverted, allowing it to remain independent from any external voltages. Additionally, the open-collector configuration eliminates the need for an additional power supply.

The 4N27W Optoisolator also features a hysteresis behavior. Hysteresis is the effect of the transistor staying in a saturated or off state even after the input signal is removed. This means that the switching speed and delay can be adjusted with the hysteresis voltage. This allows for precise and controlled switching and is ideal for applications that require exacting switching times.

Conclusion

The 4N27W Optoisolator is an ideal choice for high speed switching of signals between two circuits without electrical coupling. Its open-collector output configuration eliminates the need for an additional power supply, while its hysteresis behavior allows for precise and controlled switching. Additionally, it has a wide operating temperature range and low power consumption, making it ideal for use in medical equipment. The 4N27W Optoisolator is an excellent choice for systems that need isolation of logic signals with isolation characteristics up to 4 kV/µs.

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