2SD1577 PANASONIC-MATSUSHITA, Silicon NPN power Transistor, 
Vcbo 1500V, Vceo 700V, Vebo 6V, Ic 5A, Tc 25°C 100W, 2MHz, tf 1µs 
Case type: TO-3PF-ISOL, SOT-199, 
Marking: D1577, 
BCE