The EPC21601 from Efficient Power Conversion is a GaN Power Transistor with Drain Source Voltage 40 V, Drain Source Resistance 90 milli-ohm, Continous Drain Current 3.4 A, Turn-on Delay Time 2.5 to 4.5 ns, Turn-off Delay Time 2.8 to 4.6 ns. More details for EPC21601 can be seen below.