SFH615A-4

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Optoisolators are electronic devices designed as electrical isolation barriers between two circuits. SFH615A-4 is a type of optoisolator that has a transistor photovoltaic output. It is a 4-pin optocoupler that combines a phototransistor with a gallium arsenide infrared LED in one compact package.

The output of the SFH615A-4 is an NPN transistor with an open collector. It has protection for both electrical and optical noise and can drive a load current up to 20 mA. The LED in the optocoupler has a peak forward current of 60 mA, and the LED has a peak spectral sensitivity of 940 nm.

The SFH615A-4 has many applications, such as in industrial controls, process monitoring, security and access systems, and surveillance systems. It is used in circuits to detect signals from switches, sensors, and other electronic equipment in an electrical system. It is also used as an interface between analog and digital systems.

The working principle of the SFH615A-4 optocoupler is based on the photovoltaic effect. When light from the LED shines on the phototransistor, an electrical current is generated in the transistor. This current is used to turn on the NPN output transistor and drive the load current through it. The electrical isolation between the input and output circuits is achieved by the optical link, which prevents electrical energy from flowing between the two circuits.

The SFH615A-4 optocoupler is an effective device for isolating digitally controlled circuits from high voltages. It is also very reliable and has a low power consumption. Its compact size makes it easy to install and maintain in electronic systems. It is also ideal for use in automotive and industrial applications.

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