Catalog
Vishay CS422YTB is a 4-pin optically coupled isolation device used to transfer control signals from the input side to the output side. It allows for a variety of applications, including light dimming, triggering relays, and providing AC isolation for controlling power and safety circuits. The device includes a phototransistor, a bypass (coupling) capacitor, an isolation resistor, an opto-isolator, and a photocell. The photocell acts as a source of light when it is connected to an external source of power, and the phototransistor is activated when this light is received. The opto-isolator provides isolation between the input and the output sides, and the bypass capacitor helps to reduce and control voltage on the input side. The isolation resistor limits the current flow through the device and is used to control the power output.