The RM4953 from Rectron Semiconductor is a MOSFET with Continous Drain Current -5.1 A, Drain Source Resistance 43 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 RM4953 can be seen below.