SFH615AA-X017

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Optoisolators, also known as optocouplers, ensure total electrical isolation between input and output, connecting two circuits electrically while maintaining solid insulation between them. Transistor outputs are manufactured in a variety of packages, from surface mount soic devices to traditional dip packages. One such type of optoisolator is the SFH615AA-X017 from Vishay Intertechnology. Applications include interfacing two circuits across potentials and isolation of signals between systems.

The SFH615AA-X017 is a single channel optoisolator with a photovoltaic output (PVO). It uses an infrared LED and a phototransistor separated by a 6.2mm air gap. The opto package reduces noise between electronic circuits and provides stable switching performance over a wide temperature range. It improves system reliability by providing isolation of a low-voltage logic interface from a higher voltage signal source and protecting associated electronics from voltage spikes, lightning, and EMI/RFI noise.

The SFH615AA-X017 operates with an input current of 1 to 5mA and a peak pulse current of 10mA. The collector current, rated at 100mA, is limited by a 180Ω resistor. It features a high-voltage phototransistor with a maximum collector-emitter voltage of 30V and an on-resistance of 1.4kΩ. With an LED voltage drop of 1.6V, the isolator supplies a constant voltage of 30V (30MBar) between the LED emitter and phototransistor output. It also provides a 37dB common-mode rejection ratio (CMRR). The insulator package features built-in optical enhancements, such as an ESD protection circuit and a voltage monitor.

The working principle of the SFH615AA-X017 is centered around an LED and phototransistor pair. When the LED is turned on, it produces infrared light that is directed to the phototransistor. This light triggers the phototransistor to switch on and allow current to flow through it. This current is then sensed by the output circuit. The optoisolator will then either open or close, depending on the logic level used. The LED\'s light is also contained within the package, so it is not visible externally.

In conclusion, the SFH615AA-X017 optoisolator from Vishay Intertechnology fulfills the need for electrical isolation of low-voltage logic interfaces from higher-voltage signal sources. Its built-in ESD protection and voltage monitor help to improve system reliability, operating with a peak pulse current of 10mA and a collector current of 100mA. The LED and phototransistor pair are held within the package to enable switching of the isolator when the LED is illuminated.

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