The EPC2055 from Efficient Power Conversion is a GaN Power Transistor with Gate Threshold Voltage 0.7 to 2.5 V, Drain Source Voltage 40 V, Drain Source Resistance 3 to 3.6 milli-ohm, Continous Drain Current 29 A, Pulsed Drain Current 161 A. Tags: Die. More details for EPC2055 can be seen below.