S8050 is a three layer NPN device within the working range, the collector current IC is a function of the base current IB, a change in the base current giving a corresponding amplified change in the collector current for a given collector emitter voltage VCE.
S8550 is a three layer PNP device within the working range, the collector current IC is a function of the base current IB, a change in the base current giving a corresponding amplified change in the collector current for a given collector emitter voltage VCE.
The S9013 is a medium-powerĀ NPN transistorĀ used for general purpose switching and amplification. It features a high transition frequency of 140MHz, making it suitable for high-frequency applications. It also has a relatively large collector current capacity of 500mA.
S9014 is a three layer NPN device within the working range, the collector current IC is a function of the base current IB, a change in the base current giving a corresponding amplified change in the collector current for a given collector emitter voltage VCE.
SL100 is a three layer NPN device within the working range, the collector current IC is a function of the base current IB, a change in the base current giving a corresponding amplified change in the collector current for a given collector emitter voltage VCE.
SLA4390 is a circuit that is used primarily to control motors, they allow for forward and reverse motion of the motors. You can also build it with discrete and simple components such as with transistors and resistors.