The UF3N170400B7S from Qorvo is a Junction Field Effect Transistor (JFET) with Gate Source Threshold Voltage -11.3 to -6.7 V, Continous Drain Current 5.1 to 6.8 A, Drain Source Breakdown Voltage 1700 V, Drain Source Resistance 0.35 to 1.04 Ohm, Power Dissipation 68 W. Tags: Surface Mount. More details for UF3N170400B7S can be seen below.