VO222AT

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Optoisolators are electronic circuit elements that provide isolation between circuits by use of a light-emitting diode (LED) and a phototransistor. This isolation prevents interference between the input and output of the device, and helps protect sensitive electronic circuits from damage. The VO222AT is a specific type of optoisolator that employs a transistor, photovoltaic output.

The working principle of the VO222AT can be seen in the diagram below. The optical input, or the diode, is connected to the input pin on the device. This pin is connected to the base of a PNP phototransistor, which is in turn connected to the output pin. Light emitted from the diode represents a base current, and flows into the transistor base-emitter junction, triggering the transistor to switch on. When the transistor switches on, the collector current flows through the output pin.

The VO222AT is used in applications that require optical input isolation, with the output usually being an active digital signal. Interface applications, where there is a need to protect digital circuits from ESD or signal noise, are also common uses. This isolator can also be used in circuits that require analog signals to be taken from a noisy environment. It is also very popular in medical and automotive applications, as well as instrumentation and audio applications.

The VO222AT has a high degree of immunity to electrical noise and interference, thanks to its low DC current requirements and high IP3. It also has a very low offset between the input and output, with a differential input of 1 watt and a maximum output impedance of 5 ohms. Its surge capability is rated at up to 400 V. The device is both UL approved and RoHS compliant, making it suitable for a wide variety of applications.

The VO222AT is an easy to use, efficient optoisolator that provides adequate protection for applications requiring optical input isolation. Its low DC current requirements, high IP3, and UL approval makes it a popular option for designers of electronics who require an isolator for their applications.

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