The IRFZ48RS from Vishay is a MOSFET with Continous Drain Current 50 A, Drain Source Resistance 18 milliohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for IRFZ48RS can be seen below.