Discrete Semiconductor Devices are basic semiconductor components with a single independent function, different from integrated circuits that integrate multiple circuit units. Their core functions include circuit rectification, switching, amplification, voltage regulation, overvoltage protection and power control. Common types include diodes (rectifiers, Schottky diodes, Zener diodes, TVS diodes), bipolar junction transistors (BJT), field-effect transistors (MOSFETs, including power MOSFETs), insulated gate bipolar transistors (IGBTs) and thyristors. They feature simple structure, low cost, high reliability and strong high-power handling capability, and are widely used in power management, motor drives, new energy vehicles, photovoltaic energy storage, industrial control, consumer electronics and communication equipment.