This STP80PF55 P-Channel 55V - 0.016Ω - 80A P-Channel Power MOSFET - TO-220. This Power MOSFET is the least development of STMicroelectronics unique “Single feature size™” strip-based process.
The 2SC828 is an NPN, Silicon-based AF Amplifier Transistor that is mainly used in AF based audio equipment for amplification and switching. It has a Collector-Emitter Voltage of 25 Vdc with a Collector-Base voltage of 25 Vdc.
The 2SK3515, 2SK-3515, K3515, 3515 is a 450V, 10A, 48W TO-220NIS Package MOSFET, The FUJI Electric manufacturer is a IC Chips with N CHANNEL SILICON POWER MOSFET for more details of 2SK3515 can be seen below.
The 2SC4977 is a 400V, 7A, Silicon NPN Power Transistor. A NPN transistor is a type of bipolar junction transistor (BJT) that consists of two p-type semiconductor materials separated by a single n-type material.