The IRFI840G from Vishay is a MOSFET with Continous Drain Current 4.6 A, Drain Source Resistance 850 milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for IRFI840G can be seen below.