The RM40N100LD from Rectron Semiconductor is a MOSFET with Continous Drain Current 40 A, Drain Source Resistance 14.5 to 17 milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for RM40N100LD can be seen below.