The FBG04N30B from EPC Space is a GaN Power Transistor with Gate Threshold Voltage 0.8 to 2.5 V, Drain Source Voltage 40 V, Drain Source Resistance 5 to 8.5 milli-ohm, Continous Drain Current 30 A, Pulsed Drain Current 120 A. Tags: Surface Mount. More details for FBG04N30B can be seen below.