The STMicroelectronics STTH10LCD06SG-TR is a 10 A, 600 V ultrafast recovery rectifier in a D2PAK (TO-263) surface-mount package. Its 50 ns reverse recovery time (trr) places it in the fast-recovery class for switching power supplies, PFC boost stages, and output rectification in AC-DC converters where low switching losses matter. The 600 V reverse voltage rating suits it for 400 VDC bus rails in power-factor-correction stages and for secondary-side rectification in telecom and industrial power supplies.
50 ns trr — the switching-loss number that matters
The 50 ns reverse recovery time is the key parametric for a designer choosing this part. In a continuous-conduction-mode PFC boost stage, a slower recovery diode adds significant turn-off loss in the MOSFET and increases EMI. At 10 A forward current and 600 V blocking, this diode recovers in 50 ns, keeping the switching node clean. The forward voltage drop is 2 V at 10 A, typical for a 600 V ultrafast part — a trade-off against the faster recovery. The 5 µA reverse leakage at 600 V is low enough to avoid thermal runaway in high-temperature junction operation up to 175°C.
Engineers evaluating a new design should consider ST's current-generation 600 V ultrafast rectifiers in the same D2PAK footprint, such as the STTH10LCD06G (non-tape-and-reel variant) or later STTH10L06 series parts, verifying pin-compatibility and parametric overlap against the datasheet.