The RM4P20ES6 from Rectron Semiconductor is a MOSFET with Continous Drain Current -4.1 A, Drain Source Resistance 39 to 80 milliohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage -1 to -0.45 V. Tags: Surface Mount. More details for RM4P20ES6 can be seen below.