50 ns trr — where this diode earns its keep
Its 50 ns reverse recovery time places it in the fast-epitaxial class, not the ultrafast or SiC tier — fast enough for continuous-conduction-mode PFC and 100 kHz switching supplies, but not a 20 ns part for 500 kHz LLC converters.
8 A per leg, 1.5 Vf — heatsink math
Each diode in the common-cathode pair delivers 8 A average with a forward drop of 1.5 V maximum at that current. At 8 A total (4 A per diode), the conduction loss is roughly 6 W; at 16 A total, it hits 12 W. The TO-220 package with its metal tab needs a heatsink above about 5 W total dissipation — the tab is common-cathode, so the heatsink is electrically live unless an insulating pad is used.
175 °C junction — industrial and motor-drive margin
The 175 °C ceiling gives 25 °C of headroom over the more common 150 °C parts, which matters when the heatsink is undersized or airflow is intermittent.