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Optoisolators - Logic Output

Optoisolators are used to provide electrical isolation between a source of power, control or logic signals and a load, either to protect the load from the source, the source from the load, or both. The HCNW2601#300 is a small, economical and reliable optoisolator which is designed specifically for logic output applications. An HCNW2601#300 optoisolator uses an LED on one side and a phototransistor on the other side to provide digital isolation, and the switching rate is of up to 25kbps.

Application Field

The HCNW2601#300 makes a perfect choice for applications such as transmitting digital logic signals between two circuits operating at different voltage levels, such as a microcontroller that is connected to a computer, or as a protection circuit to protect high-value load components from damaging currents. In addition, the HCNW2601#300 optoisolator can also be used in applications such as industrial controllers and test equipment, protection of optical modems or receivers, and switching applications, such as relays and mechanical switches.

Working Principle

The HCNW2601#300 optoisolator consists of a light-emitting diode (LED) and a phototransistor, which are both arranged in the industry-standard, 4-pin Dual-in Line package. The LED transmits light to the opposite side, where the phototransistor is located, which is sensitive to the light and will switch current due to the increase in illumination. The phototransistor will switch between on and off states, depending on the amount of light that it receives from the LED. The LED requires a constant current to turn it on, while the phototransistor requires a constant voltage. The HCNW2601#300 consists of an integral current-limiting resistor for the LED, which is factory-set to ensure consistent performance.

The HCNW2601#300 is designed to provide a simple, reliable and robust power isolation solution for digital logic systems. The input-output isolation voltage is rated up to 5000V RMS. It has a low input current of 10mA, which is sufficient to drive the LED for full output current. The HCNW2601#300 also features a wide operating temperature range of -55C to +105C, which is necessary for many industrial application. The optoisolator is also incorporated with anti-slip-ring protection to increase the long-term reliability and improve damage performance.

Conclusion

The HCNW2601#300 optoisolator is an ideal choice for logic output applications, thanks to its simplicity and reliability. It provides up to 5000V RMS isolation between input and output lines and offers a wide operating temperature range. The optoisolator also features an integral current-limiting resistor, which ensures consistent performance. In addition, the HCNW2601#300 also features anti-slip-ring protection to improve damage performance.

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