What a 1500W transient suppressor does on a power rail
The 1.5SMC62AHM3/I is a unidirectional Zener-based TVS — the TransZorb® part of the 1.5SMC series — that clamps voltage spikes on a single polarity rail. The 53 V reverse standoff rating is the continuous working voltage the part holds off in normal operation — below that it looks like an open circuit; above it the clamp activates.
What 85 V clamping and 17.6 A peak pulse mean for your design
The 17.6 A peak pulse rating defines the energy the device can absorb without degradation — at 85 V clamping that is roughly 1.5 kW of transient power dumped into the TVS during the pulse window.
DO-214AB SMC package — board footprint and assembly
The DO-214AB (SMC) is a surface-mount package with a cathode bar on the bottom — the part needs a generous copper pad under that bar for thermal relief, typically driven by the package thermal resistance spec. It ships on tape and reel for automated pick-and-place, which is the standard assembly path for any automotive or telecom board.