Diacs and Sidacs are types of Discrete Semiconductors primarily used to assist in the regulation of electrical power and control of signals. Diacs are bi-directional semi-conductor devices that can be switched from a high resistance state to a low resistance state, essentially controlling the current flow, while Sidacs are five-layer, three-terminal silicon devices that are also known for voltage switching characteristics, often used to trigger thyristor devices in applications like lamp-flashing and power switching.
These components are designed to perform specific applications such as controlling motor speed, dimming lights, and managing the power in electronic devices. Diacs and Sidacs have unique characteristics like low breakover voltage, ability to withstand peak pulse current, and high breakover voltage that make them ideal for use in a variety of applications. Some of the leading manufacturers of Diacs and Sidacs include Littelfuse, Inc., Bourns, Inc., and STMicroelectronics.