What the 1500 W rating means on a real board
The 1.5KE39CA-E3/73: That 1500 W figure is the maximum power the die can absorb in a single surge event — it does not mean continuous dissipation. In a 24 VDC rail with a 33.3 V standoff, the device stays off until the transient exceeds 37.1 V (the minimum breakdown), then clamps at 53.9 V while shunting up to 27.8 A peak current. The junction handles -55°C to 175°C, so it survives hot environments like an industrial PSU or an outdoor telecom enclosure without derating at the top end.
Package and field-swap reality
Through-hole DO-201AA (DO-27) axial package — the leads are long enough to bend into existing PCB holes without a special fixture. Polarity is irrelevant here because it is bidirectional: the single die handles both polarities, so you cannot install it backwards. On a field repair, a standard soldering iron and a solder sucker are enough to swap it; no hot-air station needed. The tape-and-box (TB) packaging means parts come in a box, not a reel — fine for bench stock and small-batch builds.