The MSS20,054-H27 from Cobham Metelics is a RF Schottky Diode with Peak Reverse Voltage 0.8 V min.@100µA, Forward continuous Current 35 mA, Power Dissipation 100 mW, Capacitance 0.3 to 0.35 pF, Operating Temperature -65 to + 150 Degrees C. Tags: Surface Mount, P Type. More details for MSS20,054-H27 can be seen below.