The MSS25,143-B10D from Cobham Metelics is a RF Schottky Diode with Peak Reverse Voltage 3 V min@ 10 mA, Forward Voltage 260 to 300 V, Power Dissipation 150 mW, Capacitance 0.08 to 0.1 pF, Operating Temperature -65 to + 150 Degrees C. Tags: Surface Mount, P Type. More details for MSS25,143-B10D can be seen below.