SOT-223 surface-mount TRIAC for AC load switching
The STMicroelectronics Z0107NN 5AA4 is a logic-level sensitive-gate TRIAC in a SOT-223 surface-mount package, rated for 1 A RMS continuous on-state current and 800 V off-state blocking voltage.
Gate drive and load compatibility
The 5 mA Igt (max) and 1.3 V Vgt (max) define the logic-level interface: a standard MCU pin sourcing 5 mA into the gate turns the TRIAC on across all four quadrants, which matters for phase-control circuits where the gate drive polarity may reverse relative to MT2. The 10 mA holding current (Ih) means the device latches on once triggered and only commutates off when the load current drops below that threshold near the AC zero-crossing — typical for resistive and lightly inductive loads like small solenoids, fans, or incandescent lamps. Non-repetitive surge current is 8 A at 50 Hz and 8.5 A at 60 Hz (Itsm), giving inrush headroom for cold-filament lamps or capacitive input supplies without exceeding the junction temperature rating.
Thermal and environmental envelope
The junction temperature range spans -40°C to 125°C, covering industrial control cabinets, outdoor telecom enclosures, and under-hood automotive auxiliary loads where ambient heat plus self-heating must stay within the 125°C ceiling. A 1-inch-square copper pour on a 2-layer board typically keeps the junction rise below 40°C at 1 A RMS in still air.
ROHS3 compliant, which covers the full ten restricted substances including the four phthalates added in EU 2015/863 — no exemption expiry risk for products shipping into regulated markets.