The RB520SM-40FH from ROHM Semiconductor is a Power Diode with Forward Current 0.2 A, Forward Voltage 0.39 to 0.55 V, Reverse Current 1 to 10 uA, Reverse Voltage 40 V, Repetitive Peak Reverse Voltage 45 V. Tags: Surface Mount. More details for RB520SM-40FH can be seen below.