What 58.9 V breakdown means for a protection design
The 1.5SMC62A M6G: Choosing a TVS with a standoff below your rail gives you headroom — a 53 V standoff works cleanly on a 48 V nominal bus, where transients can spike well above 53 V without the device conducting continuously.
Thermal margin and where the SMC sits on the board
TJ maximum is 150 °C, which comfortably covers enclosed industrial equipment ambient — most board-level TVS deployments never approach that junction because the device only dissipates during brief transients. Surface-mount in the SMC package means the cathode pad solders directly to the PCB plane — adequate copper area under the pad is the primary thermal path, not the housing.