The Si7904BDN from Vishay is a MOSFET with Continous Drain Current 6 A, Drain Source Resistance 25 to 45 Milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage 0.45 to 1 V. Tags: Surface Mount. More details for Si7904BDN can be seen below.