The STMicroelectronics T835-600G-TR is an 8 A RMS, 600 V off-state Alternistor triac from the Snubberless™ series, housed in a D2PAK (TO-263) surface-mount package. The single triac configuration handles one load channel per device.
The 600 V off-state voltage directly covers 120 V and 240 V AC mains with margin for line transients. The 8 A RMS on-state current supports loads up to roughly 1.9 kW at 240 VAC (resistive), though derating for ambient temperature and heatsinking applies. Gate trigger current (Igt) is 35 mA maximum with a gate trigger voltage of 1.3 V maximum, which is compatible with standard microcontroller GPIOs via a driver transistor or optocoupler. The hold current (Ih) of 35 mA maximum sets the minimum load current needed to keep the triac latched — below this, the device turns off at zero-cross, which matters for low-power loads like small fans or LED dimmers. The non-repetitive surge current (Itsm) of 80 A at 50 Hz and 84 A at 60 Hz provides a guideline for inrush handling during motor start or capacitor charging.
Without a proper thermal via array to an inner-layer or backside copper plane, the 8 A rating cannot be sustained at elevated ambient temperatures.