The IRFBC40AS from Vishay is a MOSFET with Continous Drain Current 6.2 A, Drain Source Resistance 1200 milliohm, Drain Source Breakdown Voltage 600 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for IRFBC40AS can be seen below.