1. Core Structure: The T1235T is an Alternistor (snubberless triac) with an integrated dV/dt protection structure, making it suitable for inductive loads (e.g., motors). The ACST610 is a logic-level gate sensitive triac, optimized for resistive/capacitive loads. The T1235T can withstand a higher rate of voltage change during turn-off, whereas the ACST610 requires an external snubber circuit. 2. Trigger Sensitivity: The trigger current (Igt ≤ 10mA) and voltage (Vgt ≤ 1V) of the ACST610 are significantly lower than those of the T1235T (Igt ≤ 35mA, Vgt ≤ 1.3V). The ACST610 can be driven directly by a microcontroller or logic circuit, while the T1235T typically requires an additional driver stage. 3. Current Capability: The rated current (12A) and surge current (90A/50Hz) of the T1235T are approximately twice those of the ACST610 (6A, 45A). This indicates that under the same thermal conditions, the T1235T can handle higher power, but it must be paired with a more robust thermal design. 4. Package Thermal Performance: The ACST610 uses an I2PAK (TO-262) package, whose baseplate offers better heat dissipation efficiency than the TO-220 package of the T1235T. At the same current level, the ACST610 may exhibit lower thermal resistance, though the actual thermal performance must be assessed in conjunction with the PCB layout.