Active production — 1500 W Zener TVS for rail clamping
The 1.5SMC220A-M3/9AT: Single unidirectional channel, so the cathode band marks the protected rail side; the anode connects to ground.
Package and board-fit — DO-214AB (SMCJ) footprint
Surface-mount in a DO-214AB (SMCJ) package — the same land pattern as the standard SMC footprint, so it drops into existing layouts without a pad revision.
