The Si1442DH from Vishay is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 17 to 30 milliohm, Drain Source Breakdown Voltage 12 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage 0.4 to 1 V. Tags: Surface Mount. More details for Si1442DH can be seen below.