The DMF2183 from Skyworks is a Space Qualified Diode with Forward Voltage 250 to 310 mV, Reverse Breakdown Voltage 4 V, Temperature operating range -65 to 175 Degree C, Total Capacitance 0.30 to 0.50 pF (Junction Capacitance). Tags: Ceramic, Chip. More details for DMF2183 can be seen below.