The Si8409DB from Vishay is a MOSFET with Continous Drain Current 6.3 A, Drain Source Resistance 38 to 65 Milliohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage -0.6 to 1.4 V. Tags: Surface Mount. More details for Si8409DB can be seen below.