The GBU6J from Vishay is a Power Diode with Forward Current 3.8 to 6 A, Forward Voltage 1.0 V, Reverse Current 0.005 to 0.5 mA, Repetitive Peak Reverse Voltage 600 V, Non-Repetitive Peak Forward Current 175 A. Tags: Through Hole. More details for GBU6J can be seen below.