The 3400 from Goford Semiconductor is a MOSFET with Continous Drain Current 5.6 A, Drain Source Resistance 19 to 59 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.7 to 1.4 V. Tags: Surface Mount. More details for 3400 can be seen below.