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TRIAC
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==High commutation (two- and three-quadrant) TRIACs== Three-quadrant TRIACs only operate in quadrants 1 through 3 and cannot be triggered in quadrant 4. These devices are made specifically for improved commutation and can often control reactive loads without the use of a snubber circuit. The first TRIACs of this type were marketed by Thomson Semiconductors (now [[ST Microelectronics]]) under the name "Alternistor". Later versions are sold under the trademark "Snubberless" and "ACS" (AC Switch, though this type also incorporates a gate buffer, which further precludes Quadrant I operation). [[Littelfuse]] also uses the name "Alternistor". Philips Semiconductors (now [[NXP Semiconductors]]) originated the trademark "Hi-Com" (High Commutation). Often these TRIACs can operate with smaller gate-current to be directly driven by logic level components.
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