CNY1723S

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Optoisolators are semiconductor devices that aid in the isolation of two independently powered circuits, typically for the purposes of electrical noise reduction. Transistor, photovoltaic output optoisolators like the CNY1723S are able to do this while still providing a binary output device that can be used to trigger logic. The CNY1723S is the most current version of this type of device and as such, understanding how these devices work and what they can be used for is essential.

The CNY1723S consists of an infrared emitting diode LED, a photodiode, a phototransistor and a fourth terminal for controlling the current gain of the phototransistor. The LED and photodiode form the input part of the optoisolator, while the phototransistor forms the output part. The LED and the phototransistor are isolated from each other by the photodiode, which acts as a light barrier that prevents any electrical signals from passing between the two.

The CNY1723S works by using the photo-induced current to create a voltage across the phototransistor. When its input voltage exceeds the LED’s turn-on voltage (typically around 1.2V), the LED emits light which the photodiode detects. The photo-induced current is then converted into a voltage across the phototransistor, turning it on and producing a logic level high (1) output. The current gain of the phototransistor can be adjusted with the fourth terminal in order to create a logic-low (0) output. When the LED’s voltage drops below the turn-on voltage, the LED goes dark and the phototransistor turns off.

The CNY1723S optoisolator is designed primarily for use in logic triggering and as such, it is able to take in slow-moving or high-impedance signals from its input side and output a fast, logic-level signal. This makes it ideal for digital systems, where the input signals may be complex and the output signals need to be quick and accurate. The CNY1723S can also be used in applications where isolation is important, such as in high-voltage problems, as the photo-induced current is not affected by the voltage levels on either side.

The high-stability of the CNY1723S is also another advantage. The phototransistor is stable over temperature, making it suitable for use in applications where temperature fluctuations may be present. This makes the optoisolator suitable for use in a variety of different applications, from medical and automotive systems to security systems and industrial machinery.

The CNY1723S optoisolator is a versatile, reliable, and cost effective coupling device that is well-suited for the isolation of low speed and high impedence electrical signals. Its low current consumption and excellent high-stability make it suitable for a wide range of applications, and its robust design make it a great choice for use in digital systems or applications where isolation is important.

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