The EPC2039 from Efficient Power Conversion is a GaN Power Transistor with Gate Threshold Voltage 0.8 to 2.5 V, Drain Source Voltage 80 V, Drain Source Resistance 20 to 25 milli-ohm, Continous Drain Current 6.8 A, Pulsed Drain Current 50 A. Tags: Die. More details for EPC2039 can be seen below.