The RB550VYM-30FH from ROHM Semiconductor is a Power Diode with Forward Current 1 A, Forward Voltage 0.45 to 0.52 V, Reverse Current 1 to 30 uA, Reverse Voltage 30 V, Repetitive Peak Reverse Voltage 30 V. Tags: Surface Mount. More details for RB550VYM-30FH can be seen below.