The is a high-gain NPN Darlington power transistor designed for medium-power linear and switching applications. It is widely used in circuits requiring high current amplification, such as motor drivers, audio amplifiers, and relay drivers, thanks to its monolithic Darlington configuration which integrates two transistors and an antiparallel diode into a single package. Key Technical Specifications
This combination made it the perfect candidate for in CRT monitors and televisions. In those old TVs, controlling the electron beam required high voltage and fast switching—the BD679 was built exactly for this stressful environment. bd679 datasheet