The STW46NF30 from STMicroelectronics is a MOSFET with Continous Drain Current 42 A, Drain Source Resistance 63 to 75 Milliohm, Drain Source Breakdown Voltage 300 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for STW46NF30 can be seen below.