The DF2B18FU from Toshiba is a Power Diode with Dynamic Resistance 0.8 ohm, Reverse Current 0.1 uA, Reverse Voltage 16.2 to 20.5 V, Repetitive Peak Reverse Voltage 12 V, Non-Repetitive Peak Forward Current 2.5 A. Tags: Surface Mount. More details for DF2B18FU can be seen below.