The SiHFBF30S from Vishay is a MOSFET with Continous Drain Current 3.6 A, Drain Source Resistance 3700 Milliohm, Drain Source Breakdown Voltage 900 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for SiHFBF30S can be seen below.