The IRF9Z34S from Vishay is a MOSFET with Continous Drain Current -18 A, Drain Source Resistance 140 milliohm, Drain Source Breakdown Voltage -60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -2 to -4 V. Tags: Surface Mount. More details for IRF9Z34S can be seen below.