The GS66508P from GaN Systems is a GaN Power Transistor with Gate Threshold Voltage 1.1 to 2.6 V, Drain Source Voltage 650 V, Drain Source Resistance 50 to 129 milli-ohm, Continous Drain Current 25 to 30 A, Pulsed Drain Current 72 A. Tags: Die. More details for GS66508P can be seen below.