600 V off-state, 1 A RMS — the Z0107MN6AA4 in a logic-level load-switching role
The Z0107MN6AA4 is a logic-level sensitive-gate TRIAC from STMicroelectronics, rated for 600 V off-state voltage and 1 A RMS on-state current. It is designed for low-power AC load switching where the gate drive comes from a microcontroller or logic output — the 5 mA maximum gate trigger current (Igt) and 1.3 V maximum gate trigger voltage (Vgt) mean a standard GPIO pin can drive it directly through a series resistor, no external transistor buffer needed. The 1 A RMS rating is the continuous current the TRIAC can conduct when the junction stays within the -40°C to 125°C operating range. At 125°C junction temperature, the on-state resistance has roughly doubled from its 25°C value, so the thermal design — the SOT-223 package's copper pad area on the PCB — sets the real current ceiling in a given ambient.
Surge handling and gate sensitivity — what the ratings mean for the BOM
Non-repetitive surge current (Itsm) is 8 A at 50 Hz and 8.5 A at 60 Hz. This is the peak current the TRIAC can withstand for one mains half-cycle — useful for capacitive loads like a switched-mode power supply input or a lamp cold-filament inrush. The 10 mA maximum hold current (Ih) means the TRIAC will stay latched on once triggered, down to a load current of about 10 mA; below that it commutates off at the zero-crossing. The logic-level gate sensitivity (5 mA Igt max) is the key differentiator from standard TRIACs that need 10-50 mA gate drive. In a 3.3 V or 5 V logic system, the gate resistor is sized to deliver at least 5 mA at the minimum logic-high voltage — a 3.3 V supply with a 330 Ω series resistor gives roughly 6 mA, comfortably above the threshold. The SOT-223 package (TO-261-4) has a small thermal pad on the tab; for 1 A RMS continuous, the PCB copper area under the tab should be at least 1 square inch per side to keep the junction temperature rise under 40°C.
Active production, ROHS3 — sourcing and compliance
The Z0107MN6AA4 is listed as Active in production and ROHS3 compliant. It is a current-design part suitable for new builds and BOM fill. The base product number is Z0107; the suffix MN6AA4 denotes the SOT-223 package and the 600 V, 1 A rating variant.