The PJD4NA50A from PANJIT Semiconductor is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 2000 to 2300 milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for PJD4NA50A can be seen below.