The P50LF4QTKD from Shindengen America is a MOSFET with Continous Drain Current 50 A, Drain Source Resistance 4.4 to 9.6 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.5 to 2.5 V. Tags: Surface Mount. More details for P50LF4QTKD can be seen below.