A 50 ns trr at 15 A forward current and 600 V blocking voltage keeps reverse-recovery charge low enough that a hard-switched PFC stage runs with manageable turn-off losses. That trr figure is the reason this part is specified over a standard 200 ns+ recovery rectifier — the designer gets lower junction temperature rise and higher efficiency at the same output power.
2.9 V forward drop at 15 A — the conduction loss trade-off
The forward voltage is 2.9 V at 15 A, which is typical for a fast-recovery diode in this voltage class. That Vf is higher than a standard 600 V rectifier, but the fast recovery is what enables the switching frequency. The trade-off is acceptable in PFC and flyback stages where switching losses dominate the thermal budget.
No last-time-buy notice or obsolescence risk for current designs.