The SGF48N20S1 from Solid State Devices is a GaN Power Transistor with Gate Threshold Voltage 0.8 to 2.5 V, Drain Source Voltage 200 V, Drain Source Resistance 11 to 16 milli-ohm, Continous Drain Current 40 A, Pulsed Drain Current 200 A. Tags: Surface Mount. More details for SGF48N20S1 can be seen below.