The S8550 is a PNP Epitaxial Silicon Transistor. 40V 500mA 2W Output Amplifier of Portable Radios in Class B Push-pull Operation. Complimentary to SS8050.
The IRF3710 MOSFET is a Field Effect Transistor has a drain voltage of 100V, gate voltage of 20V and drain current of 57A. A MOSFET is an abbreviation for Metal Oxide Semiconductor Field Effect Transistor TO-220 Package.
The MJH6284G, MJH6284, 6284 is a – 100V 20A 4MHz 160W NPN - Darlington Bipolar Transistor Through Hole TO-218 from ON Semiconductor. MJH6284(NPN), MJH6287(PNP) Darlington Complementary Silicon Power Transistors.