1500W TVS in a DO-214AB — what the ratings mean on the bench
The 1.5SMC10A M6G: That 1500W figure tells you how much energy it can shunt in a single transient — enough to clamp a 108A surge at the clamping voltage of 14.5V without failing. The reverse standoff voltage is 8.55V, meaning the TVS stays out of the circuit below that rail voltage. Breakdown starts at 9.5V minimum, so a 5V or 3.3V supply rail is well within the margin. The clamping voltage max of 14.5V at 108A is the voltage the protected node sees during the pulse — downstream components must survive that ceiling.
Package and board-fit — DO-214AB (SMC) footprint
Surface-mount in a DO-214AB (SMC) package — the same footprint as standard SMC diodes. Supplied on Tape & Reel (TR), so it feeds directly into a pick-and-place line. No power line protection (it's a Zener TVS, not a crowbar device), so it's best suited for signal or low-voltage DC rail clamping, not AC mains.
Sourcing and lifecycle — active production, no cross-reference on record
If you're qualifying a second source, you'd need to bench-test a parametric match from another manufacturer — the 1.5SMC10A's 8.55V standoff and 1500W rating are common enough that a drop-in from Littelfuse or Vishay is plausible, but not confirmed here.