This is the part's defining safety spec — it allows the low-voltage control side (microcontroller GPIO, logic-level signal) to switch a 600 V off-state AC load while maintaining reinforced insulation. The 6-DIP through-hole package (0.400" lead spacing) is the standard footprint for this class of industrial optotriac, and the -55°C to 100°C operating range covers most motor-drive, HVAC, and appliance environments.
10 kV/µs dV/dt — false-trigger immunity in noisy environments
The minimum static dV/dt of 10kV/µs means the output triac will not falsely trigger from fast voltage transients on the AC line — the kind you see from inductive load switching, motor brushes, or relay contact bounce. This is a key parameter for industrial and appliance designs where the optotriac sits on a shared noisy mains bus. The 2 mA maximum LED trigger current keeps the drive requirement low enough for a standard microcontroller GPIO through a current-limiting resistor.