SFH628A-2

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Optoisolators, also called optically coupled isolators or photocouplers, are devices designed to provide electrical isolation between two electrical circuits with the use of light. Among the different types of optoisolators, the transistor, photovoltaic output type, also known as SFH628A-2, has specific applications and working principle.

Application field of SFH628A-2

The SFH628A-2 optoisolator device is used in applications requiring a constant isolation of up to 4 kV, such as televisions, computers, office automation, audio-visual and communication equipment, home appliances, automotive electronic systems, and industrial applications. This optoisolator ensures reliable and consistent operation over a wide operating temperature range (−40°C to +105°C).

Working principle of SFH628A-2

The SFH628A-2 optoisolator is constructed by an infrared emitting diode and a NPN silicon photo-transistor in the same package. An electrical signal fed into the input side, is converted into light by the internal LED, and this light is gathered by the internal photo-transistor, which in turn controls the flow of current at the output side. The dielectric isolation between input and output sides is determined by the use of the transparent lens that separates the LED from the transistor. The package allows a wide range of application areas and a broad voltage range from 5 V to 30 V.

The SFH628A-2 optoisolator features low crosstalk, robust operation over a wide operating temperature range, and a wide voltage range for greater design flexibility. Its fast response time and low maximum power consumption make it one of the most efficient optoisolator solutions for many industrial and automotive applications. Additionally, the optoisolator is available with a variety of different output configurations, including open collector, totem-pole, common emitter, and an inverted common emitter.

Conclusion

The SFH628A-2 optoisolator is an efficient device for providing electrical isolation between two electrical circuits with the use of light. This type of optoisolator ensures reliable and consistent operation over a wide temperature range (−40°C to +105°C). It has low crosstalk, robust operation, fast response time, and a wide voltage range, allowing its use in a variety of applications such as televisions, computers, office automation, audio-visual and communication equipment, home appliances, and automotive electronic systems.

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