The ISG6109QA from Innoscience is a GaN Power Transistor with Drain Source Voltage -7 to 700 V, Drain Source Resistance 320 to 450 milli-ohm, Continous Drain Current 4 A, Pulsed Drain Current 8 A, Output Capacitance 13.7 pF. Tags: Surface Mount. More details for ISG6109QA can be seen below.