The FBG20N18B from EPC Space is a GaN Power Transistor with Gate Threshold Voltage 0.8 to 2.5 V, Drain Source Voltage 200 V, Drain Source Resistance 21 to 28 milli-ohm, Continous Drain Current 18 A, Pulsed Drain Current 72 A. Tags: Surface Mount. More details for FBG20N18B can be seen below.