This part is a kind of semiconductor called 2N6505.

Function of this product has SILICON CONTROLLED RECTIFIERS.

Manufacturers : Motorola

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Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Thyristors Silicon Controlled Rectifiers . . . designed primarily for half-wave ac control applications, such as motor controls, heating controls and power supply crowbar circuits. • Glass Passivated Junctions with Center Gate Fire for Greater Parameter Uniformity and Stability • Small, Rugged, Thermowatt Constructed for Low Thermal Resistance, High Heat Dissipation and Durability • Blocking Voltage to 800 Volts • 300 A Surge Current Capability Order this document by 2N6504/D 2N6504 thru 2N6509* *Motorola preferred devices SCRs 25 AMPERES RMS 50 thru 800 VOLTS G AK CASE 221A-04 (TO-220AB) STYLE 3 MAXIMUM RATINGS (TJ = 25°C unless otherwise noted.) Rating * Peak Forward and Reverse Blocking Voltage(1) (Gate Open, TJ = 25 to 125°C) 2N650 [ ... ]

2N6505 PDF Datasheet Download