The TPHR6503PL1 from Toshiba is a MOSFET with Continous Drain Current 420 A, Drain Source Resistance 0.41 to 0.89 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.1 to 2.1 V. Tags: Surface Mount. More details for TPHR6503PL1 can be seen below.