The STD4NK100Z from STMicroelectronics is a MOSFET with Continous Drain Current 2.2 A, Drain Source Resistance 5600 to 6800 Milliohm, Drain Source Breakdown Voltage 1000 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 4.5 V. Tags: Surface Mount. More details for STD4NK100Z can be seen below.