The STLJS050N12MCLL from onsemi is a MOSFET with Continous Drain Current 4.5 A, Drain Source Resistance 50.6 milliohm, Drain Source Breakdown Voltage 120 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 1.5 V. Tags: Surface Mount. More details for STLJS050N12MCLL can be seen below.