The VOM617A-3T with Transistor Output Optocouplers manufactured by Vishay is an optoelectronic coupling device that contains a phototransistor output and an LED light source. This device has a collector-emitter voltage of 30 V, a forward current of 5 mA, and a CTR ratio of 100–200%. These optocouplers are specifically designed to isolate and transmit electrical signals between two circuits, helping to protect one circuit from the indeterminate condition of the other. Features of the VOM617A-3T include excellent long-term stability, responsiveness, and isolation.