The STP15NK50Z from STMicroelectronics is a MOSFET with Continous Drain Current 14 A, Drain Source Resistance 300 to 340 Milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 4.5 V. Tags: Through Hole. More details for STP15NK50Z can be seen below.