The EPC2901C_55 from Efficient Power Conversion is a GaN Power Transistor with Gate Threshold Voltage 0.8 to 2.7 V, Drain Source Voltage 100 V, Drain Source Resistance 3.1 to 7 milli-ohm, Continous Drain Current 36 A, Pulsed Drain Current 150 A. Tags: Die. More details for EPC2901C_55 can be seen below.