The DF2S5.1FS from Toshiba is a Power Diode with Dynamic Resistance 70 ohm, Reverse Current 1.0 uA, Reverse Voltage 4.8 to 5.4 V, Repetitive Peak Reverse Voltage 1.5 V, Peak Reverse Voltage 1.5 V. Tags: Surface Mount. More details for DF2S5.1FS can be seen below.