The RM185N30DF from Rectron Semiconductor is a MOSFET with Continous Drain Current 185 A, Drain Source Resistance 1.1 to 1.8 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2 V. Tags: Surface Mount. More details for RM185N30DF can be seen below.