The Si1900DL from Vishay is a MOSFET with Continous Drain Current 0.63 A, Drain Source Resistance 410 to 700 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for Si1900DL can be seen below.