What is a SIDAC?

SIDAC or Silicon Diode for Alternating Current is a semiconductor device that conducts current when the applied voltage exceeds its breakdown voltage in either direction. It is typically used for triggering other semiconductor devices like thyristors or TRIACs in AC circuits, controlling AC power, and providing protection against voltage surges.

A SIDAC is a two-terminal semiconductor device that exhibits negative resistance characteristics. It is designed to conduct current when the applied voltage exceeds its breakdown voltage in either direction. Unlike a DIAC, which triggers conduction in both directions, a SIDAC is unidirectional, meaning it conducts current in only one direction. When the voltage across the SIDAC reaches its breakdown voltage, it enters a low-resistance state, allowing current to flow through it.

SIDACs are commonly used in applications where a voltage threshold needs to be detected or where the device needs to be triggered at a specific voltage level. They are often used in ignition systems, gas discharge tubes, overvoltage protection circuits, and relaxation oscillators.

SIDACs from the leading manufacturers are listed on everything PE. You can use the filters on the left side to narrow down the list of products based on your requirements – break-over voltage, gate trigger current, package type, etc. Our parametric search tool will scan multiple manufacturer websites to identify SIDACs that meet your requirement. You can then download datasheets, and request quotations via everything PE. Your inquiry will be routed to the manufacturer or their representative who will give you more information on the product.