MBD301 diodes equivalent, silicon hot-carrier diodes schottky barrier diodes.
http://onsemi.com
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Extremely Low Minority Carrier Lifetime − 15 ps (Typ) Very Low Capacitance − 1.5 pF (Max) @ VR = 15 V Low Reverse Leakage − I.
They are readily adaptable to many other fast switching RF and digital applications. They are supplied in an inexpensiv.
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