4N28TM

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Optoisolators are electronic equipment used for isolating signals and power between two electrically dissimilar circuits. A 4N28TM optoisolator is a Transistor, Photovoltaic Output optoisolator, which is widely used in sensing and controlling circuits because of its features such as high-speed operation, low power consumption, and high isolation voltage. It is suitable for digital and analog circuits, and can be used in multiple applications.

4N28TM Application Field

The 4N28TM(Tx-4N28) optoisolator is typically used in optical communication systems, alarm systems, electronic signaling, circuit isolation, and solid-state relays. It is suitable for use in high-speed, low-power applications and can provide isolation between low-voltage logic signals and high-voltage or high-current load circuits. In particular, the 4N28TM optoisolator can be used to produce low-level AC/DC lamp indication for communications systems, automatic-control monitoring, and error indication for alarm systems.

The 4N28TM optoisolator can also be used for voltage regulation, where it is employed to limit voltage rise and reduces fires, causing spikes in electrical power.

Additionally, the 4N28TM optoisolator can be used in medical applications, such as patient monitoring systems, medical implants, diagnostic equipment, and drug delivery systems. Moreover, it is also suitable for use in a variety of other applications, including LED displays, high-speed pulse counters, and robotics.

4N28TM Working Principle

The 4N28TM optoisolator operates as a bridge between two systems or circuits that are electrically isolated. It features two input terminals for connecting an input signal and a light-emitting diode (L.E.D.). Furthermore, it has two output terminals for connecting to a load.

When the input terminals are used to produce an input signal, the light-emitting diode (L.E.D.) illuminates, activating a phototransistor that is connected to the output terminals. The phototransistor then produces an output signal corresponding to the input signal, which can then be applied to the load.

The 4N28TM optoisolator has an isolation voltage of 5 KV, which is particularly useful when working with high-voltage or high-current applications. It also has a maximum operating speed of 100 KHz, making it ideal for digital applications, and a minimum turn-on voltage of 0.8V, which enables it to operate with low power.

The 4N28TM optoisolator is a highly reliable device, having a typical lifetime of 800,000 hours at up to 35C. Furthermore, it is capable of providing an extremely high level of noise immunity, making it suitable for any application requiring noise immunity.

Conclusion

The 4N28TM optoisolator is a highly reliable, low-power device for digital and analog circuits. It can be used in a variety of applications, including lighting indication, voltage regulation, patient monitoring, medical implants, diagnostics, and robotics. Additionally, it features an isolation voltage of 5 KV, a maximum operating speed of 100 KHz, and a minimum turn-on voltage of 0.8V, making it ideal for high-speed, low-power applications.

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