STMicroelectronics' triacs are used to control AC mains applications. They can be used as simple on/off switches, to replace electromechanical relays while providing a higher degree of flexibility (through electronic control) and superior reliability. Using a simple phase-control circuit, they can also be used to control the power level through AC loads.

ST’s portfolio includes devices with voltage ratings up to 800 V and RMS on-currents up to 40 A in general-purpose standard configurations, a high-commutation T series in Snubberless™ technology, and high-temperature triacs for use in harsh environments. They are the reference for universal motor drivers in appliance applications due to their ability to manage the inrush conditions when driving inductive loads.

They are available in plastic molded or ceramic isolated and non-isolated, through-hole power packages as well as surface-mount packages.

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