BT139-800E TO-220 TO-220AB BT139-800E 4Q Triac General description Planar passivated sensitive gate four quadrant triac in a SOT78 ( T0-220AB) plastic package intended for use in general purpose bidirectional switching and phase control applications. This sensitive gate series E triac i s intended to be interfaced directly to microcontrollers, logic integrated circuits and other low power gate trigger circuits. Features and benefits • Direct triggering from low power drivers and logic ICs • High blocking volt age capability • Planar passivated for voltage ruggedness .