The GBU8G from Vishay is a Power Diode with Forward Current 3.9 to 8 A, Forward Voltage 1.0 V, Reverse Current 0.005 to 0.5 mA, Repetitive Peak Reverse Voltage 400 V, Non-Repetitive Peak Forward Current 200 A. Tags: Through Hole. More details for GBU8G can be seen below.