The MSS30,454-B40 from Cobham Metelics is a RF Schottky Diode with Peak Reverse Voltage 2 V min.@10 mA, Forward continuous Current 50 mA, Forward Voltage 0.23 to 0.35 V, Current 50 mA, Power Dissipation 150 mW. Tags: Surface Mount, N Type. More details for MSS30,454-B40 can be seen below.