The B340LB from Vishay is a Power Diode with Forward Current 3.0 A, Forward Voltage 0.34 to 0.45 V, Reverse Current 0.4 to 40 mA, Repetitive Peak Reverse Voltage 40 V, Non-Repetitive Peak Forward Current 100 A. Tags: Surface Mount. More details for B340LB can be seen below.