Nxp bt series triacs to 220ab nxp bt137 600d an 8a 600v planar passivated very sensitive gate four quadrant triac intended for use in general purpose bidirectional switching and phase control applications where high sensitivity is required in all four quadrants this very sensitive gate series d triac is intended to be interfaced directly to microcontrollers logic integrated circuits and other low power gate trigger circuits suitable applications include general purpose motor controls g