The STP3NK90Z from STMicroelectronics is a MOSFET with Continous Drain Current 3 A, Drain Source Resistance 3600 to 4800 Milliohm, Drain Source Breakdown Voltage 900 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 4.5 V. Tags: Through Hole. More details for STP3NK90Z can be seen below.