The RM90N40DF from Rectron Semiconductor is a MOSFET with Continous Drain Current 90 A, Drain Source Resistance 3.2 to 7 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.2 to 2.5 V. Tags: Surface Mount. More details for RM90N40DF can be seen below.