Function: 'Quasi-Resonant Off-Line Switching Control'. Note: VDS 650VAC, Rds(on) 0.65 Ohms. Marking on the case: SC1S311A. Number of terminals: 7. RoHS: yes. Spec info: Startup Pin Voltage (4, 8 pins) 600V. Assembly/installation: surface-mounted component (SMD). Housing: SO. Housing (according to data sheet): SO-8 (7 pins). VCC: 30 v