The RM50P40LD from Rectron Semiconductor is a MOSFET with Continous Drain Current -52 A, Drain Source Resistance 10.5 to 20 milliohm, Drain Source Breakdown Voltage -40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -2.5 to -1 V. Tags: Surface Mount. More details for RM50P40LD can be seen below.