2N-6  -  Series DataSheet
2N6403TG  -  SCRs 16A, 400V 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; or wherever half-wave silicon gate-controlled, solid-state devices are needed.
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 Volts
•Pb-Free Packages are Available*