The 4N60A from Goford Semiconductor is a MOSFET with Continous Drain Current 2.78 to 4 A, Drain Source Resistance 1950 to 2300 milliohm, Drain Source Breakdown Voltage 600 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount, Through Hole. More details for 4N60A can be seen below.