The EPC21603 from Efficient Power Conversion is a GaN Power Transistor with Drain Source Voltage 40 V, Drain Source Resistance 90 milli-ohm, Continous Drain Current 1.7 A, Turn-on Delay Time 3.5 to 4.5 ns, Turn-off Delay Time 3.1 to 4 ns. More details for EPC21603 can be seen below.