The 3401 from Goford Semiconductor is a MOSFET with Continous Drain Current -4.2 A, Drain Source Resistance 39 to 70 milliohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage -1.3 to -0.6 V. Tags: Surface Mount. More details for 3401 can be seen below.