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The Vishay optocoupler is an optically coupled pair consisting of a gallium arsenide infrared emitting diode optically coupled to a silicon NPN phototransistor. Signal information, including a DC level can be transmitted by the device while maintaining a high degree of electrical isolation between input and output. This device can be used to replace relays and transformers in many digital interface applications, as well as analog applications such as CRT modulation.

Long term stability
Industry standard dual-in-line package