4N263SD

Optoisolators - Transistor, Photovoltaic Output

Optoisolators are devices used to transfer electrical signals between two isolated circuits. Isolation takes place by using an optical medium between the two sides, resulting in improved circuit safety and fewer unwanted signals. They are commonly used in applications requiring high speed, low power, and/or isolation. The 4N263SD is an optoisolator offering a transistor photovoltaic output, making it suitable for a wide range of applications.

Applications

The 4N263SD optoisolator is a suitable component for digital logic, continuous lighting, automotive, and home security applications. It is used for switching loads, high speed signal transmission, motor speed control, and signal transmission from input devices to a processor controller. The product also features high tolerance to EMC, EFT, and surge events, making it suitable for industrial applications requiring exceptional electrical performance.

Working Principle

The working principle of a 4N263SD optoisolator relies on the LED/ photodetector diode combination to transfer electrical signals between two isolated circuits. The LED side consists of a 5Vdc input that energises a single LED source (which emits invisible infrared radiation) when triggered by an input signal. This radiation is then detected by the photodetector diode, which acts as a photosensitive switch. The output of the photodetector is in the form of a transistor-type photovoltaic output which can then be used to drive a load circuit.

Performance Advantages

The 4N263SD optoisolator offers various advantages over other optoisolators. It allows for higher input impedance devices to be used, while still operating at lower currents than other devices. Additionally, its low capacitance provides faster output response and higher isolation voltage. As the output is a transistor-type photovoltaic, this also provides more power handling than a pure photovoltaic output. The product also provides a high common-mode transient immunity which eliminates the need for additional suppression circuits.

Conclusion

The 4N263SD optoisolator is a component designed to fit several applications due to its impressive performance parameters and features. This includes digital logic, motor speed control, signal transmission for input devices, continuous lighting, automotive and home security applications. As the device uses a transistor photovoltaic output, it has a high power handling capacity and allows for higher input impedance while operating at lower currents. Additionally, thanks to its low capacitance, it can provide high-speed output response and improved isolation voltage.