The 490 mV forward voltage drop at 15 A keeps conduction losses low in secondary-side rectification, OR-ing diodes, and freewheeling clamp circuits.
30 V Vr and 150°C junction — where the margin lives
The 30 V reverse voltage gives comfortable headroom on a 12 V rail and still works on a 24 V rail with 25% derating. Maximum junction temperature of 150°C sets the thermal budget — the 15 A per diode rating assumes the case temperature is kept within the datasheet derating curve. Reverse leakage is 1 mA at 30 V, which is typical for a 30 V Schottky at rated Vr; expect leakage to climb with junction temperature, so the thermal design should account for that at high load.
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