The IRF730B from Vishay is a MOSFET with Continous Drain Current 6 A, Drain Source Resistance 1000 milliohm, Drain Source Breakdown Voltage 400 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Through Hole. More details for IRF730B can be seen below.