TVS selection: 43V rail, 1.5kW pulse, DO-214AB
Its reverse standoff voltage of 43V and minimum breakdown voltage of 47.8V ensure it stays transparent during normal operation but triggers before the rail exceeds safe limits. With a peak pulse power rating of 1500W (1.5kW) per the 10/1000µs waveform and a clamping voltage of 76.7V at 19.6A peak pulse current, this part absorbs substantial surge energy while limiting the let-through voltage to levels typical for 48V telecom or 36V industrial bus protection.
Breakdown and clamping margin
The 4.8V gap between the 43V standoff and the 47.8V minimum breakdown provides margin for DC rail ripple and tolerance without false triggering. The 76.7V maximum clamping at 19.6A defines the upper voltage stress the downstream components must survive — a figure to compare against the absolute maximum ratings of your powered ICs.