1. Trigger Characteristics (Core Difference): - BTA08-800BW3G: Standard trigger (Igt = 50 mA), requiring relatively high gate drive current. - BTA06-800TWRG: Logic‑level trigger (Igt = 5 mA), which can be driven directly by a microcontroller I/O pin or logic‑level signal. - The drive circuit architectures for the two types are fundamentally different. A circuit designed for a standard‑trigger TRIAC (e.g., using a pulse transformer or large current‑limiting resistor) may cause false triggering or gate overstress if directly connected to a logic‑level device. Conversely, a logic‑level drive circuit may not deliver sufficient current to reliably trigger a standard‑trigger TRIAC. 2. Current Capability: - BTA08-800BW3G: Rated on‑state current 8 A RMS; surge current (Itsm) 90 A. - BTA06-800TWRG: Rated on‑state current 6 A RMS; surge current (Itsm) 60–63 A. - The substitute device exhibits approximately 25% lower continuous current rating and surge withstand capability. Sufficient derating must be ensured for both maximum steady‑state current and in‑rush current in the application; otherwise, overheating or failure may occur. 3. Holding Current: - BTA08-800BW3G: Holding current (Ih) 60 mA. - BTA06-800TWRG: Holding current (Ih) 10 mA. - The logic‑level device turns off more readily after current zero‑crossing. In applications with low load current or distorted waveforms, the standard‑trigger type may offer more stable operation and avoid unintended turn‑off due to its higher holding current, whereas the logic‑level type can be more sensitive when controlling small load currents.