The EPC2040 from Efficient Power Conversion is a GaN Power Transistor with Gate Threshold Voltage 0.8 to 2.5 V, Drain Source Voltage 15 V, Drain Source Resistance 24 to 30 milli-ohm, Continous Drain Current 3.4 A, Pulsed Drain Current 28 A. Tags: Die. More details for EPC2040 can be seen below.