DO-214AB SMC footprint and thermal path
The 1.5SMC56CA-E3/9AT: For a 1500 W pulse, the junction temperature rise is dominated by the pulse duration, not the steady-state copper area, but a solid thermal via array under the tab helps if repetitive surges are expected. The bidirectional structure (single channel) means a single device protects a signal pair or a differential bus without needing two back-to-back unidirectional parts.
