What the delay times mean for your rail
The 10 µs turn-on delay is fast enough to catch a sagging rail before the downstream converter browns out, but slow enough to avoid false triggering on load transients. The 200 µs turn-off delay gives the failing rail time to decay gracefully, preventing the good rail from back-feeding into a short. If you're sizing hold-up capacitors, the off-delay sets the window the output must stay within spec before the FET opens—tighten the cap bank if your load pulls hard during that 200 µs.
Lifecycle and sourcing reality
No direct pin-compatible second source is listed in the official record, but the part is widely stocked across the surplus channel—the scorch mark on a dead board tells you this controller is usually the part that survived, not the one that failed.