The BSO604NS2 from Infineon Technologies is a MOSFET with Continous Drain Current 4 to 5 A, Drain Source Resistance 31 to 44 Mohms, Drain Source Breakdown Voltage 55 V, Gate Source Voltage 20 V, Gate Source Threshold Voltage 1.2 to 2 V. Tags: Surface Mount. More details for BSO604NS2 can be seen below.