The SiAA40DJ from Vishay is a MOSFET with Continous Drain Current 30 A, Drain Source Resistance 9.6 to 16 Milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.4 V. Tags: Surface Mount. More details for SiAA40DJ can be seen below.