Dual fast-recovery diode in TOP-3I — what the ratings mean
Its 27 ns reverse recovery time places it in the ultrafast class, suited for high-frequency switching in power supplies and motor drives where recovery charge drives the snubber and switching loss budget.
27 ns trr — switching loss and snubber sizing
At 27 ns typical reverse recovery time, the diode recovers fast enough for 50–100 kHz hard-switched converters without excessive turn-off loss. The snubber network across each diode can be sized smaller than with a 200 ns part, saving board area and component count. That said, the 30 µA reverse leakage at 200 V rises with junction temperature — at 125 °C junction expect several times that figure, which matters for standby power in always-on supplies.
1.05 V forward drop at 30 A — conduction loss
At 30 A per diode the forward drop is 1.05 V maximum, yielding about 31.5 W conduction loss per diode at full rated current. With two diodes sharing the same case, the total dissipation can reach 63 W — the TOP-3I package needs a heatsink with adequate thermal capacity.
For production designs this means you can qualify the part into the BOM without scheduling a second-source migration. For spares and MRO stock, the active status also means the factory continues to ship fresh-date-code parts through distribution — no mystery surplus lots to vet.