Obsolete — sourcing for existing BOM lines
The 1.5KE6.8AHE3/51: A board-level functional replacement would need to match the 1500W peak pulse rating, 5.8V reverse standoff, and DO-201AA footprint.
What the ratings mean for circuit protection fit
The 143A peak pulse current at the 10.5V clamping voltage tells you the diode can sink a high-energy surge without failing short, which is the primary selection criterion for an automotive load-dump or inductive-kickback clamp. Reverse standoff voltage is 5.8V — the diode remains non-conducting below this level, so a 5V rail stays clean during normal operation. Breakdown occurs at 6.45V minimum, clamping the transient to 10.5V maximum before the TVS conducts the surge current to ground. AEC-Q101 qualification means the device has passed automotive-grade reliability screening: temperature cycling, high-temperature reverse bias, and ESD robustness per the automotive IC standard.
Package and board integration
Through-hole DO-201AA (DO-27) axial package — the leads insert into plated through-holes on the PCB and are wave-soldered. The bulk packaging means parts are loose in a tube or bag, not taped-and-reeled; plan for manual or tube-fed placement, not automated pick-and-place from a reel. Single unidirectional channel — one TVS diode per package, cathode banded. For bidirectional protection on an AC or bipolar rail, two devices in anti-series or a dedicated bidirectional part is needed.