BUY D1804 https://www.utsource.net/itm/p/257446.html
SILICON CONTROLLED RECTIFIER
Description: The D1804 is a NPN epitaxial planar silicon transistor manufactured by Sanyo. Features: - High current capacity - Low collector-emitter saturation voltage - High switching speed - Low noise Applications: The D1804 is suitable for use in switching applications, such as relay drivers, lamp drivers, and motor drivers. It can also be used in audio amplifiers, power supplies, and other general-purpose applications. (For reference only)