The Si1539CDL from Vishay is a MOSFET with Continous Drain Current 0.7 A, Drain Source Resistance 323 to 1700 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1.2 to 2.5 V. Tags: Surface Mount. More details for Si1539CDL can be seen below.