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30 ns reverse recovery — the spec that defines the fit
The headline rating on this part is the 30 ns reverse recovery time (trr). That places it in the fast-recovery class — suitable for hard-switching topologies like a 200 V PFC boost stage or a flyback snubber where recovery losses and EMI matter. The 990 mV forward drop at 3 A is typical for a 200 V-class fast diode at this current density; thermal design should budget for that drop at the operating current.
TO-220 dual common-cathode — footprint and circuit role
The 1 Pair Common Cathode configuration in a TO-220-3 package means the two diode cathodes are tied internally to the tab. The anode connections are pins 1 and 3. This is a standard pinout for a dual rectifier in a TO-220 — the common cathode is the mounting surface, so the tab is at cathode potential. Through-hole mounting, no exposed paddle. The package is the familiar TO-220 outline, supplier device package TO-220. The tab is electrically live; if a heatsink is used, an insulating pad is needed unless the heatsink is at cathode potential.
Temperature and leakage — the margin reality
Junction temperature rating is 150°C max. The reverse leakage at 200 V is 50 µA — that's at 25°C; expect leakage to roughly double every 10°C rise, so at 125°C junction it's in the milliamps. That's normal for a fast recovery diode and should be factored into standby loss estimates. The 50 µA at 200 V spec is the maximum at room temperature; typical is lower.