TRIACs, or Triode for Alternating Current, are semiconductor devices falling under the category of thyristors. Designed for AC power control, TRIACs possess three terminals and exhibit bidirectional conductivity, allowing them to regulate both halves of an AC waveform. These components find extensive use in applications requiring phase control, such as dimmers, motor speed controllers, and light dimming circuits, offering efficient control over AC power. The cost of TRIACs varies based on factors like the manufacturer, current and voltage ratings, and package type. Prices typically range from a few cents to a few dollars per unit, depending on the specific requirements and features of the TRIAC. When purchasing TRIACs, focus on critical parameters such as current and voltage ratings to ensure compatibility with your application. Consider additional features like gate trigger voltage, holding current, and the TRIAC's package type.