Discrete semiconductors are single-function devices — diodes, transistors, and thyristors — that switch, rectify, and amplify at the board level. This category covers rectifier, Schottky, and Zener diodes, BJTs, MOSFETs, IGBTs, and SCR/TRIAC thyristors across through-hole and surface-mount packages. Key manufacturers include onsemi, Vishay, Nexperia, Infineon, and Diodes Incorporated.