Its Snubberless design means it can switch inductive loads — motors, solenoids, transformers — without the external RC snubber network a standard triac typically requires. That saves board space, reduces BOM count, and eliminates the snubber's power dissipation.
The TO-220-3 package is through-hole, with a metal tab for heatsink mounting. The tab is electrically connected to the MT2 terminal — account for that in layout if using a shared heatsink. The single triac configuration means one device per package; no internal paralleling. The supplier device package is TO-220, which is the standard 3-lead isolated or non-isolated variant; verify the specific mounting-hole and tab dimensions against your heatsink design.
No NRND or EOL notice is on record. For dual-source resilience, the closest functional peer within the same Snubberless Alternistor family is the T1235-600G, which shares the 600 V / 12 A rating and Snubberless Alternistor type, though it comes in a surface-mount package (not through-hole).