VOD223T Isolators

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Optoisolators are electromechanical components that are used to obtain electrical isolation between two systems. Basically, an optoisolator consists of an optical source (LED or laser diode), typically connected to an output circuit, and a light-sensitive device, typically connected to an input circuit. When an electric current passes through the LED, it emits light which is detected by the light-sensitive device, thus providing electrical isolation between both circuits. One particular type of optoisolator is the VOD223T, which is a Transistor, Photovoltaic Output optoisolator.

The VOD223T optoisolator is an 4-pin component that is designed with an NPN photo-transistor as its output power device, providing a photovoltaic switching/sensing solution. It features a high collector-emitter voltage of 80 volts in normal operation, high isolation voltage of 3750 Vrms for one minute, a low output current to start-up current ratio (L/IAS), and the ability to switch up to 50mA of current. The internal current limiting circuitry provides protection to both the LED and transistor output – making the VOD223T optoisolator suitable for a wide range of applications such as industrial, automotive, communication, and consumer electronic applications.

The VOD223T optoisolator utilizes an NPN transistor as its output power device. The collector is connected to the positive output voltage, the base is connected to the LED, and the emitter is connected to the negative output voltage. This configuration allows for the electric current from the LED to activate the transistor, switching the output voltage on and off. When the LED is turned on, the collector-emitter voltage (CE) is at 0V. When the LED is off, the CE voltage rises to the collector supply voltage. The LED current is determined by the current limiting circuitry, and the transistor’s switching and holding current can be adjusted by the addition of a series resistor.

The VOD223T optoisolator is commonly used in applications for electrical signal isolation, communication signals, protective isolation, power supply control, and alarms. It is also used for switching AC and low-voltage DC loads, as well as for power protection. The optoisolator is capable of withstanding a wide input voltage range, making it suitable for use in industrial, automotive, communication, and consumer electronic applications. Due to its low output current to start-up current Ratio (L/IAS), the VOD223T optoisolator can provide a reliable and fast switching times for any load.

The VOD223T optoisolator is a reliable and cost-effective device that is suitable for a variety of applications. It features a high collector-emitter voltage of 80 volts in normal operation, high isolation voltage of 3750 Vrms for one minute, and the ability to switch up to 50mA of current. The internal current limiting circuitry provides protection to both the LED and transistor output, making it an ideal device for a variety of applications. With its wide input voltage range and fast switching times, the VOD223T optoisolator is ideal for use in industrial, automotive, communication, and consumer electronic applications.

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