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The 70 ns reverse recovery time (trr) places this diode in the fast recovery class, suitable for continuous-current-mode (CCM) power factor correction, output rectification in switching power supplies, and freewheeling diodes in hard-switched converters up to the 100 kHz range. The 600 V reverse voltage rating and 30 A average rectified current give it headroom for a 400 V DC bus at 10–15 A continuous load with derating. The 1.85 V forward drop at 30 A is the on-state loss you budget for in the thermal calculation — at 30 A that is 55 W of conduction loss, so the TO-220AC package needs a heatsink sized for that dissipation.
