2SD2478, ROHM Semiconductor, Silicon NPN Darl+Di Power Transistor, 
Vcbo 80V, Vceo 80V, Vebo 7V, Ic 4A, Tc 25°C 30W, 40MHz, hFE 1000..10000,
Case type: TO-220F ISOL,
Marking: D2478, 
BCE 

Complementary PNP 2SB1616