The Z0103MA 5AL2 is a logic-sensitive gate triac from STMicroelectronics, rated for 600 V off-state voltage and 1 A RMS on-state current in a TO-92-3 through-hole package. The 600 V block handles 230 VAC mains with healthy margin for line transients; the 1 A continuous rating suits small inductive loads like relays, solenoids, and fractional-horsepower fans.
Gate sensitivity — why 3 mA Igt simplifies the drive
With a maximum gate trigger current of 3 mA and a gate trigger voltage of 1.3 V, this triac qualifies as logic-sensitive — it can be fired directly from a microcontroller GPIO or a low-power logic output without a separate driver transistor. The 7 mA hold current ensures the device latches on once triggered, even with lightly inductive loads that might otherwise drop below the holding threshold.
The TO-92-3 package with formed leads suits through-hole assembly on single-sided boards or point-to-point wiring.
Surge capability and lifecycle
Non-repetitive surge current is rated at 8 A for 50 Hz and 8.5 A for 60 Hz, giving enough headroom for capacitor inrush or lamp cold-start surges.