The SiA931DJ from Vishay is a MOSFET with Continous Drain Current -4.5 A, Drain Source Resistance 52 to 100 Milliohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -2.2 to -1.2 V. Tags: Surface Mount. More details for SiA931DJ can be seen below.