The TPN4R203NC from Toshiba is a MOSFET with Continous Drain Current 53 A, Drain Source Resistance 3.5 to 6.4 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.3 to 2.3 V. Tags: Surface Mount. More details for TPN4R203NC can be seen below.