Why zero trr matters in a 1200 V boost stage
The STPSC20H12D is a 1200 V, 20 A Silicon Carbide Schottky diode in a TO-220AC package.
1200 V blocking — the PFC and DC-link tier
The 1200 V reverse voltage rating puts this diode in the 800 V bus, three-phase PFC, and EV charger DC-link class. A 600 V SiC Schottky would need derating headroom that eats into the margin; at 1200 V you get a full 400 V safety band over a nominal 800 V rail, covering transients from grid surges and motor regeneration without avalanche stress. Forward voltage is 1.5 V maximum at 20 A.
20 A in a TO-220AC — thermal reality
20 A average rectified current through a TO-220AC package is achievable only with adequate heatsinking.