The RM4A3P303L from Rectron Semiconductor is a MOSFET with Continous Drain Current -4.3 A, Drain Source Resistance 40 to 90 milliohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -3 to -1 V. Tags: Surface Mount. More details for RM4A3P303L can be seen below.