The STP4N150 from STMicroelectronics is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 5000 to 7000 Milliohm, Drain Source Breakdown Voltage 1500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Through Hole. More details for STP4N150 can be seen below.