The Si1023CX from Vishay is a MOSFET with Continous Drain Current 0.45 A, Drain Source Resistance 630 to 1440 milliohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage -0.4 to -1 V. Tags: Surface Mount. More details for Si1023CX can be seen below.