DIACs (Diode Alternating Current) and SIDACs (Silicon Diode for Alternating Current) are commonly used in triggering circuits and AC power control applications. DIACs are bidirectional diodes that exhibit a negative resistance characteristic, allowing them to conduct in both forward and reverse directions when a certain voltage threshold is reached. SIDACs are unidirectional thyristor devices that can switch on at a specific voltage level and conduct current until the current drops below a holding current level. Higher voltage and current ratings, tighter triggering specifications, and additional features such as surge capability may contribute to higher price points for DIACs and SIDACs. When purchasing DIACs and SIDACs, consider the specific requirements of your circuit. Determine the voltage and current ratings needed for reliable operation and compatibility with your system. Pay attention to the triggering characteristics, including breakdown voltage and switching speed, to ensure proper functionality in triggering and AC control applications. Additionally, verify the package type and mounting options for ease of integration into your circuit design.