The Si1031R/X from Vishay is a MOSFET with Continous Drain Current 0.16 A, Drain Source Resistance 8000 to 20000 milliohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -6 to 6 V, Gate Source Threshold Voltage -0.4 to -1.2 V. Tags: Surface Mount. More details for Si1031R/X can be seen below.