The IRFBC30S from Vishay is a MOSFET with Continous Drain Current 3.6 A, Drain Source Resistance 2200 milliohm, Drain Source Breakdown Voltage 600 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for IRFBC30S can be seen below.