SFH6206AGR

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Optoisolators are optoelectronic devices that isolate electrical signals using a photonic barrier. This is accomplished by converting the electrical impulse into a light pulse, sending it across an optically coupled barrier, and then converting it back into an electrical signal on the other side. The SFH6206AGR is a special type of optoisolator, specifically a Transistor, Photovoltaic Output optoisolator, and is one of the most powerful optoisolators currently available. This article will discuss the application fields and working principles of this device.

Application Field

Transistor, Photovoltaic Output optoisolators like the SFH6206AGR are used in applications where high-voltage isolation is required. The device is robust enough to withstand high voltages of up to 5000Vrms, which makes it suitable for industrial and telecommunications applications. It is also used in applications that require photovoltaic coupling such as data transfer between system components, switch mode power supplies, isolated AC/DC converters, and digital isolators.

Working Principle

At the heart of the SFH6206AGR is a photovoltaic output transistor, which converts input electrical signals into a light signal. This light signal then passes through an optical isolator, which is sandwiched between two photodiodes. The first photodiode converts the light signal into an electrical current and the second photodiode converts this current into an output electrical signal. The output electrical signal mirrors the input signal but, because of the optical isolation, cannot pass any electrical current back into the circuit.

The SFH6206AGR also features a built-in flyback protection diode to help protect against unwanted transient voltages. This diode, which is connected between the output and the ground line, will switch to a high impedance state if the output voltage goes beyond the specified limit. This ensures that any excess voltage does not damage the device.

The device is also designed to reduce electromagnetic interference (EMI) levels. This is accomplished through the use of low impedance current paths and capacitive voltage dividers, which allow a smaller circuit size than would be required if traditional methods were used. As a result, the device has a low profile and is capable of producing very low EMI levels.

The SFH6206AGR is a powerful optoisolator that provides a high level of isolation between input and output signals. It is suitable for a wide range of applications, especially those that require high-voltage isolation and low electromagnetic interference.

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