1.5SMC8.2CA — what it is and what it protects
The 1.5SMC8.2CA R7G: For lines with higher prospective fault current, a 5 kW or 15 kW SMC series part is the right fit.
Clamping window and thermal headroom
The gap between 7.79 V breakdown and 12.1 V clamping is the protection window — it defines how much voltage overshoot the protected rail tolerates before the TVS drags it down. Junction temperature runs to 150 °C maximum — the -55 °C cold end covers automotive cold-crank and outdoor-equipment cold-weather startup; the 150 °C ceiling is set by the die-attach and mold compound thermal limit, not the Zener junction itself. On a double-sided board with limited copper spread, verify the steady-state thermal resistance keeps the TJ below 125 °C at your worst-case ambient.
Package, mounting, and reel availability
The DO-214AB SMC is a wider-body SMA-variant — the larger die pad area relative to a standard SMA gives better thermal transfer to the board copper, which is why the 1.5SMC series hits 1500 W in this package rather than a smaller SMA footprint. Solder paste reflow profile follows standard lead-free assembly; the tape-and-reel packaging suits high-volume pick-and-place lines. The CA suffix denotes bidirectional polarity — it sits across an AC line or a symmetric rail pair. Verify pin 1 and pin 2 orientation against the layout: a bidirectional TVS connected backwards clamps the wrong polarity and offers no protection on the intended half-cycle.