SFH1690AT Isolators

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Optoisolators, also known as optocouplers, opto-isolators, photocouplers, or optical isolators, are components that use a light emitting diode (LED) to optically isolate two circuits. SFH1690AT is a popular optoisolator of the transistor, photovoltaic output type.

SFH1690AT has very high insulation resistance and operates at high temperatures. It consists of a chip LED optically linked to a sensitive Photo Transistor. This permits high-frequency AC or DC isolation between two circuits. It is suitable for temperature operation ranges between -40°C to 125°C.

SFH1690AT Application Fields

The SFH1690AT optoisolator is generally used in power supply control, motor control, PLC, and communication isolators. It is also well-suited for medical systems, IT products, industrial controls, and consumer electronics such as LCDs, televisions, set-top boxes, smart meters, and other home appliances.

The SFH1690AT optoisolator is often used to electrically isolate a control circuit from a power control circuit. This ensures that electric shock will not occur when an open circuit is created in the control circuit, since the power control circuit is electrically isolated from the control circuit. Further, the SFH1690AT optoisolator can also increase resistance to electromagnetic interference in the control circuit, which can improve the reliability of the system.

SFH1690AT Working Principle

SFH1690AT optoisolator works on the principle of an LED emitting light that is then received by an integrated circuit such as a photovoltaic cell. The LED transmits a light signal across a gap and is received by the photovoltaic cell. When light falls on the photovoltaic cell, it generates photoelectric current. This current is then used to generate a voltage across the optoisolator circuit.

The LED in the optoisolator receives power from the isolated control circuit and emits a light signal that falls on the photovoltaic cell. The photovoltaic cell produces a current that is then used to drive the output transistor in the isolated power circuit. This, in turn, activates the power circuit components.

SFH1690AT optoisolator is an efficient and inexpensive way to generate an electrical isolation layer between a control circuit and a power circuit. The electrical isolation prevents electrical shock and interference from external sources which may affect the output. Additionally, the SFH1690AT operating characteristics also make it a suitable choice for high-temperature environments.

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