What this TVS protects and how it fails
The 1.5KE24CHE3/73 is a 1500 W peak-pulse TransZorb TVS diode from Vishay's automotive-grade AEC-Q101 series, clamping at 34.7 V on a 43.2 A 10/1000 µs surge. When a TVS fails short from an overstress event, the scorch mark on the board tells you this part absorbed the hit. The DO-201AA axial package is a through-hole footprint that survives rework well — you can pull the dead part and solder in a replacement without lifting pads.
Obsolete — sourcing the 1.5KE24CHE3/73 today
For a board that needs this exact TVS, the supply path runs through independent surplus and broker channels. No pin-compatible drop-in replacement is documented by Vishay, so a board spin would be required to move to a different TVS family.
AEC-Q101 and the automotive temperature envelope
For a 24 V truck or heavy-equipment rail, the 19.4 V standoff leaves margin above the nominal bus voltage. The 34.7 V clamp keeps the transient below the 40 V abs-max of many common automotive-grade buck converters and linear regulators.