This part is a kind of semiconductor called 2CL77.

Function of this product has HIGH VOLTAGE DIODES.

Manufacturers : GETE ELECTRONICS

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Some of the text within the PDF file :

HVGT 2CL77 5mA 20kV HIGH VOLTAGE DIODES 2CL77 is high reliability resin molded type high voltage diode in small size package which is sealed a multilayed mesa type silicon chip by epoxy resin. Features High speed switching High Current High surge resisitivity for CRT discharge High reliability design High Voltage Applications X light Power supply Laser Voltage doubler circuit Microwave emission power Maximum Ratings and Characteristics Absolute Maximum Ratings Outline Drawings : mm Lot No. Cathode Mark o 3.0 o 0.6 27 min. 12 27 min. DO-312 Cathode Mark Type Mark 2CL77 VVV Items Symbols Condition Repetitive Peak Renerse Voltage V RRM Average Output Current IO Ta=25°C,Resistive Load Suege Current I FSM Junction Temperature Tj Allowable Operation Case Temperature S [ ... ]

2CL77 PDF Datasheet Download