2N-6  -  Series DataSheet
2N6399TG  -  Thyristor, SCRs 12 AMPERES RMS 50 thru 800 VOLTS Silicon Controlled Rectifiers  -  ON Semiconductor  -  Silicon Controlled Rectifiers

Designed primarily for half‐wave ac control applications, such as motor controls, heating controls and power supplies.
Features
•Glass Passivated Junctions with Center Gate Geometry for Greater Parameter Uniformity and Stability
•Small, Rugged, Thermowatt Construction for Low Thermal Resistance, High Heat Dissipation and Durability
•Blocking Voltage to 800 V
•Pb-Free Packages are Available*