The EPC8004 from Efficient Power Conversion is a GaN Power Transistor with Gate Threshold Voltage 0.8 to 2.5 V, Drain Source Voltage 40 V, Drain Source Resistance 80 to 110 milli-ohm, Continous Drain Current 4 A, Pulsed Drain Current 7.5 A. Tags: Die. More details for EPC8004 can be seen below.