SFH1690ABT

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Optoisolators are electrical components used to isolate an electrical circuit from an external source. They rely on a light-emitting diode to transmit a signal across an insulating barrier. While the external source may be of a different type, optically coupled Photovoltaic Output Transistors, such as the SFH1690ABT, are very common. The following article will explain the application field and working principle of the SFH1690ABT.

The SFH1690ABT is a Photovoltaic Output Transistor Optoisolator that helps isolate high voltage circuits from lower voltage control circuits. It is more efficient than other optoisolators, such as those utilizing a Darlington transistor or a UJT. It is designed to protect the control circuits from transients in the higher voltage circuits. The SFH1690ABT has a wide operating temperature range of -40 to +85 degrees Celsius and is available in dual-in-line packages.

The SFH1690ABT includes a photodiode, an infrared LED, and a NPN output transistor, all encased within a single package. When an input voltage is applied to the optoisolator, the photodiode captures photons from the LED within the package, producing a current in the diode. This current charges the photodiode and the base of the NPN output transistor. This causes the current to flow through the collector-emitter of the output stage, resulting in a voltage between the collector and emitter. This current can then be used to send a signal to an external circuit.

The SFH1690ABT has a number of advantages over other optoisolators. It is built with a compact rugged design, which is resistant to external noise and high voltage transients. It has an improved current transfer ratio, which allows a higher level of signal transfer and isolation. Additionally, it has a high photoresponse frequency and low capacitance. Finally, it has low power consumption, allowing it to be used in smaller and more energy efficient circuits.

The SFH1690ABT is a versatile optoisolator that can be used in a variety of applications. It is ideal for use in low-speed motor control, LCD back-lighting, keyboard systems, encoders, and other low-voltage control circuits. It can also be used in home appliances, office automation equipment, and automotive electronic devices. The SFH1690ABT is a reliable and efficient optoisolator, ideal for use in a wide range of applications.

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