The RM42N200DF from Rectron Semiconductor is a MOSFET with Continous Drain Current 42 A, Drain Source Resistance 28 to 32 milliohm, Drain Source Breakdown Voltage 200 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for RM42N200DF can be seen below.