Sensitive-gate triac for low-power AC switching
The STMicroelectronics Z0107NA 1AA2 is a logic-level sensitive-gate triac in the Z0107 series, rated for 800 V off-state voltage and 1 A RMS on-state current. The 5 mA maximum gate trigger current (Igt) means it switches directly from a microcontroller or logic output without a separate driver transistor — a BOM simplification for low-current AC loads like solid-state relays, fan speed controllers, or small valve actuators.
800 V blocking and surge handling
With an 800 V off-state voltage, this triac handles 230 VAC mains with margin for the peak repetitive voltage (325 V) plus typical line transients up to 600 V — the 800 V rating keeps the device out of avalanche on a standard residential or light-industrial supply. The non-repetitive surge current (Itsm) is 8 A at 50 Hz and 8.5 A at 60 Hz, which covers inrush from a small motor or capacitive load on turn-on without needing an external snubber in many cases. The 10 mA maximum holding current (Ih) ensures the triac latches on once triggered and stays conducting until the load current drops below that threshold near the AC zero-crossing — a standard figure for 1 A class devices that prevents premature turn-off with inductive loads.
TO-92 package and thermal profile
Housed in the TO-92-3 (TO-226AA) through-hole package, the Z0107NA 1AA2 suits low-component-count designs where a surface-mount triac would require a separate heatsink or thermal via array. The -40°C to 125°C junction temperature range covers outdoor equipment enclosures and appliance hot-side environments — the 125°C upper limit is the die temperature, not the ambient, so derate the 1 A RMS current above 25°C per the datasheet's thermal resistance curve.
Lifecycle and sourcing posture
For a BOM line that needs a sensitive-gate triac at 800 V, this is a straightforward active part to specify.