The RM3N700S4 from Rectron Semiconductor is a MOSFET with Continous Drain Current 3 A, Drain Source Resistance 1300 to 1500 milliohm, Drain Source Breakdown Voltage 700 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2.5 to 4 V. Tags: Surface Mount. More details for RM3N700S4 can be seen below.