The S9013 is a medium-power NPN transistor used for general purpose switching and amplification. It features a high transition frequency of 140MHz, making it suitable for high-frequency applications.
The BD140 is a PNP Epitaxial Planar Transistor that is mounted in the SOT-32 plastic package. They are designed for audio amplifiers and drivers utilizing complementary or quasi-complementary circuits.
The MJE13001 is a common BJT NPN switching transistor that is found in lamp ballasts and (cheap) phone chargers because of its high breakdown voltage and current capacity.
The D882 is a medium power NPN transistor that features a high collector-emitter breakdown voltage and medium current carrying capability. It can also be mounted on a heatsink using the screw hole in the SOT-32 package.
The BC488 is a PNP Transistor in a TO-92 package, that has a VCE of -60V and a collector current of -1000mA or -1A. It can be used as a small signal switching transistor.