The EPC2219 from Efficient Power Conversion is a GaN Power Transistor with Gate Threshold Voltage 0.8 to 2.5 V, Drain Source Voltage 65 V, Drain Source Resistance 1700 to 3300 milli-ohm, Continous Drain Current 0.5 A, Pulsed Drain Current 0.5 A. Tags: Die. More details for EPC2219 can be seen below.