The G4N65J from Goford Semiconductor is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 2000 to 2400 milliohm, Drain Source Breakdown Voltage 650 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 3 to 4 V. Tags: Through Hole. More details for G4N65J can be seen below.