1. Triac Type and Triggering Characteristics: The BTA12 is a standard triac requiring a relatively high gate drive current (Igt max 50mA). In contrast, the BTA06 is a logic-sensitive gate (logic-level) triac, needing only minimal drive current (Igt max 5mA). The BTA06 can be driven directly by a microcontroller or logic IC I/O pin without additional transistors or buffer circuits, thereby simplifying the drive stage design and reducing system cost. 2. Current Carrying Capability: The BTA12’s rated on-state current (12A) and surge current (105A) are approximately double those of the BTA06 (6A, ~60A). Consequently, the BTA06 has significantly lower power handling and transient overload (e.g., inrush current) tolerance compared to the BTA12. Direct replacement may lead to device overheating and failure in high-load or surge-prone applications. 3. Holding Current: The BTA06 has a much lower holding current (Ih max 10mA) than the BTA12 (50mA). This allows the BTA06 to maintain more stable conduction when driving very light loads, reducing the risk of unintended turn-off near current zero-crossings. On the other hand, it also makes the BTA06 slightly more susceptible to false triggering or latching due to induced currents in environments with significant electromagnetic interference (EMI).