The RM120N40LD from Rectron Semiconductor is a MOSFET with Continous Drain Current 120 A, Drain Source Resistance 2.6 to 5.5 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for RM120N40LD can be seen below.