The DF3A5.6LFU from Toshiba is a Power Diode with Dynamic Resistance 50 ohm, Reverse Current 1.0 uA, Reverse Voltage 5.3 to 6.0 V, Temperature operating range -55 to 150 Degree C, Reverse Breakdown Voltage 5.3 to 6.0 V. Tags: Surface Mount. More details for DF3A5.6LFU can be seen below.