SFH617A-1X001

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SFH617A-1X001 application field and working principle

Optoisolators, also known as optocouplers, opto-couplers, photocouplers, and optical isolators, are components used for insulation purpose between two circuits, usually between input and output signals. The SFH617A-1X001 is a gallium-arsenide-phosphide (GaAsP) transistor photovoltaic output optoisolator, which contains an LED input element and an integrated photovoltaic linearly-amplified electric transducer output element. It provides isolation between the input and output circuits to prevent high voltage transients or electrical noise from affecting sensitive circuits.

The applications of the SFH617A-1X001 include isolation of the control circuits from the power circuits in the signal transmission systems, providing surge protection for the load circuit, and insulation of analog signals in industrial field instruments. The isolation capability of the device makes it useful in applications where an electrical isolation between the control and the power circuits is desired. It is also suitable for use in automated production equipment in areas such as laser processing.

Working Principle

The SFH617A-1X001 features an LED input element and an integrated photovoltaic linearly-amplified electric transducer output element. It is designed to provide electrical insulation between two circuits using the optical isolation of an LEDs short wavelength light emission and the photovoltaic conversion of that light into an electrical signal.

When an input current is applied to the LED, it emits a short wavelength light which is directed onto the surface of the photovoltaic device. The light is absorbed by the photovoltaic material and converted into an electric current which is proportional to the intensity of the incident light. This electric current, which is the output signal, is isolated from the input signal because of the optical insulation.

Due to the GaAsP material used as the photovoltaic element, the SFH617A-1X001 has a low dark current and low capacitance. This makes it an ideal optoisolator for applications where low capacitance is desired, such as high frequency switching, as it can switch faster than other optoisolators. Additionally, the device operates over a wide operating temperature range of -40°C to 125°C, making it suitable for industrial applications.

Conclusion

The SFH617A-1X001 is a GaAsP transistor photovoltaic output optoisolator that provides electrical isolation between two circuits using the optical isolation of an LEDs short wavelength light emission and the photovoltaic conversion of that light into an electrical signal. It is suitable for industrial applications which require low capacitance, high frequency switching, and wide temperature range operation.

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