What the 1500 W rating means on a unidirectional TVS
The 1.5SMC11: Unidirectional (single-channel) construction means it protects one signal or power line referenced to ground — the cathode band on the DO-214AB body marks the protected side.
Obsolete — sourcing reality for the 1.5SMC11
No official successor order code is recorded. The DO-214AB (SMC) footprint is shared across the 1.5SMC series, so a parametric cross to a higher-voltage or higher-power sibling in the same package is possible, but no pin-compatible drop-in replacement is documented by the manufacturer.
Board-fit and temperature envelope
Surface-mount DO-214AB (SMC) package — the same footprint as the SMCJ industry standard. The junction operates from -55 °C to 150 °C, covering industrial and automotive under-hood ambient ranges without derating the peak pulse power at the low end.