2SK904, FUJI Electric, Field-Effect Transistor Silicon N-Channel MOSFET, 
Vdss 800V, Vgss ±20V, Id 3A, Tc=25°C Pd 80W, RDS(on) 3Ω, 
Case type: TO-220, 
Marking: K904, 
GDS 
2SK904 = 2SK903(40W TO220F ISOL)