Snubberless™ Alternistor – 600V / 16A in D²Pak
The T1650-600G-TR is an STMicroelectronics Snubberless™ Alternistor triac rated for 600 V off-state voltage and 16 A RMS on-state current in a D²Pak (TO-263) surface-mount package. The Alternistor structure provides improved commutating dV/dt performance over a conventional triac, making it suited for motor and transformer loads where the current-zero crossing is abrupt.
Parametric fit – gate drive and surge margin
Gate trigger current (Igt) is 35 mA max, and gate trigger voltage (Vgt) is 1.3 V max – a standard logic-level gate drive from a microcontroller I/O pin or optocoupler can fire it directly, though a series resistor is still needed to limit gate current. Hold current (Ih) of 35 mA max ensures the triac latches on once triggered and does not drop out prematurely under light load. The non-repetitive surge rating of 160 A at 50 Hz / 168 A at 60 Hz gives headroom for motor-start inrush or capacitor charging events.
Package and thermal design note
The tab is internally connected to the MT2 terminal – the PCB layout must account for this common connection and isolate the pad if the heatsink is grounded.