The GAN039-650NBB from Nexperia is a GaN Power Transistor with Gate Threshold Voltage 3.3 to 4.8 V, Drain Source Voltage 650 V, Drain Source Resistance 33 to 39 milli-ohm, Continous Drain Current 42 to 60 A, Total Charge 30 nc. Tags: Surface Mount. More details for GAN039-650NBB can be seen below.