45 ns trr — the switching edge this diode is built for
That trr puts it squarely in the class of diode you pick for hard-switching topologies — PFC boost, flyback clamp, or the secondary-side catch diode in an offline converter — where a standard 1N4007's multi-microsecond recovery would burn through the switching budget and heat up the junction. The forward drop is 1.7 V at the full 1 A rated current, which is the typical conduction-loss trade-off for a 600 V fast-recovery part.
SMB package — footprint and thermal reality
The DO-214AA (SMB) package is a surface-mount footprint that fits standard reflow profiles. The reverse leakage is specified at 1 µA at the full 600 V blocking voltage — that is a room-temperature typical; expect it to climb with junction temperature, so budget the off-state loss in the thermal calculation for high-line operation.