3750Vrms isolation in a 4-SSOP package
The VOS627A-3T is a single-channel phototransistor optocoupler from Vishay, housed in a compact 4-SSOP (4-SOIC) surface-mount package. It provides 3750Vrms galvanic isolation between input and output, with a transistor output rated for 80V and 50mA continuous. The input accepts both AC and DC drive, and the current transfer ratio is specified between 100% and 200% at a forward current of 5mA.
CTR and switching speed for logic interfacing
With a CTR range of 100% to 200% at 5mA, this part delivers a consistent gain margin for driving logic inputs or low-power loads. The 400mV maximum Vce saturation keeps the output swing close to the rail, important for 3.3V or 5V logic families.
The 3750Vrms isolation is sufficient for reinforced insulation in many mains-connected designs.