The BSP603S2L from Infineon Technologies is a MOSFET with Continous Drain Current 4.1 to 5.2 A, Drain Source Resistance 23 to 40 Mohms, Drain Source Breakdown Voltage 55 V, Gate Source Voltage 20 V, Gate Source Threshold Voltage 1.2 to 2 V. Tags: Through Hole. More details for BSP603S2L can be seen below.