The Z0107DA 1AA2 is a logic-level sensitive-gate triac from STMicroelectronics, rated for 1 A RMS on-state current and 400 V off-state voltage. The sensitive gate (5 mA max trigger current) allows direct drive from a microcontroller or logic output without an intermediate driver transistor. Housed in a through-hole TO-92-3 package (TO-226AA), it suits low-power AC switching in compact designs where board space is tight and wave-soldering is the assembly method.
STMicroelectronics has marked the Z0107DA 1AA2 as obsolete.
Surge and thermal margins
Non-repetitive surge current is rated 8 A at 50 Hz and 8.5 A at 60 Hz — this covers the inrush from a small incandescent lamp or capacitive load, but the designer should verify the actual surge energy against the device's I²t capability for the specific load. The hold current of 10 mA max means the triac will commutate off cleanly in a resistive load drawing above that threshold; for inductive loads, a snubber network across the MT1-MT2 terminals is recommended to prevent false turn-on from dV/dt transients.