The IRFBC20S from Vishay is a MOSFET with Continous Drain Current 2.2 A, Drain Source Resistance 4400 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 IRFBC20S can be seen below.