4N28VM

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Optoisolators - Transistor, Photovoltaic Output, such as the 4N28VM, offer electrical isolation to protect sensitive electronic circuits from damage caused by high voltage or high current. Optoisolators provide isolation between input and output circuits, allowing signals to be passed between them while preventing current flow and voltage surges. This type of optical isolator is ideal for safeguarding sensitive electronics from high voltage electromechanical equipment, and other sources of electrical noise or interference.

The 4N28VM optoisolator consists of an infrared light emitting diode (LED) optically coupled to a phototransistor in a plastic housing. The LED and phototransistor are not electrically connected; light signals from the LED, which is electrically connected to the input, activate the phototransistor. The phototransistor is electrically connected to the output circuit. The 4N28VM is especially useful in applications that require high speed response, with its minimum guaranteed rise and fall time of 4 ns. It features a low current transfer ratio with a wide range of input and output currents.

The 4N28VM optoisolator can be used in a variety of applications, including power supplies, security systems, industrial and consumer equipment, motor control systems, audio and video equipment, programmable controllers, and digital signalling. It can be used to switch low voltage signals, protect low voltage circuits, and isolate input signals from output signals. Moreover, the 4N28VM optoisolator can provide noise isolation, electronic timing, and response time control.

The working principles behind the 4N28VM optoisolator are based on the interaction between the light generated by its LED and an optically sensitive semiconductor, the phototransistor. A current into the LED activates it, producing light which is in turn absorbed by the optically sensitive semiconductor. This interaction triggers the phototransistor to switch on, and a current flows between its collector and emitter terminals. The phototransistor cannot be triggered by normal electrical signals, and offers an ideal solution for isolating control, measurement, and feedback signals.

The 4N28VM optoisolator provides a reliable frequency response in the range 0.2 Hz to 10 MHz. It can also handle a maximum input voltage of 5 V, and a maximum output current of 200 mA. It has a wide range of operating temperatures, from -55 to +125°C. This makes it suitable for a broad range of applications, from industrial to consumer electronics.

In summary, the 4N28VM optoisolator is an ideal device for providing electrical isolation between input and output circuits, while protecting sensitive electronics from high voltage electromechanical equipment and other sources of electrical noise and interference. It offers a low current transfer ratio, fast response time, and a wide range of operating temperatures, making it suitable for a variety of applications.

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