The STP17NK40ZFP from STMicroelectronics is a MOSFET with Continous Drain Current 15 A, Drain Source Resistance 230 to 250 Milliohm, Drain Source Breakdown Voltage 400 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 4.5 V. Tags: Through Hole. More details for STP17NK40ZFP can be seen below.