Logic-sensitive gate triac — 800 V, 1 A RMS, TO-92-3
The Z0103NA 5AL2 is an STMicroelectronics logic-sensitive gate triac in the standard TO-92-3 through-hole package. With an 800 V off-state voltage and 1 A RMS on-state current rating, it is sized for low-power AC switching in appliance, lighting, and small motor control circuits. Logic-sensitive gate triacs require only 3 mA max gate trigger current and 1.3 V max gate trigger voltage, making them directly drivable by logic-level outputs — microcontrollers, ASIC I/O pins, or low-power sensor circuits — without an intermediate transistor stage. The 7 mA max holding current means the device latches on once triggered and stays conducting until the load current drops below that threshold, which is typical for resistive and lightly inductive AC loads.
Surge and thermal robustness in a small footprint
Non-repetitive surge current is rated at 8 A for 50 Hz and 8.5 A for 60 Hz — this peak capability handles inrush from incandescent lamps or capacitive loads without device failure, as long as the surge event is isolated and the junction temperature stays within the -40°C to 125°C operating range. The TO-92-3 package (TO-226AA) with formed leads is a compact through-hole format suited for low-profile PCB layouts where a heatsink is not practical; the 1 A RMS rating assumes free-air convection at 25°C ambient — derate for elevated enclosure temperatures. Single triac configuration in a three-lead package — the gate, MT1, and MT2 pins follow the standard TO-92 pinout for this class, simplifying drop-in replacement in existing designs.
STMicroelectronics has marked the Z0103NA 5AL2 as Obsolete. No official successor or pin-compatible replacement is recorded from the manufacturer. New designs should avoid this part; existing BOM lines rely on surplus or broker inventory. Availability is lot-specific — we source through independent distribution channels, and each RFQ is confirmed with current stock positions and date codes at quote time. No stock-holding claim is made here.