Active production, 35 ns recovery — the STTH3R06 is a general-purpose fast diode for PFC and snubber circuits
The STTH3R06 is an STMicroelectronics fast-recovery rectifier rated 600 V reverse and 3 A average forward current, with a 35 ns reverse recovery time (trr) that suits continuous-conduction-mode PFC boost stages and snubber clamps in switched-mode supplies.
35 ns trr at 3 A — the recovery speed governs switching loss in hard-switched topologies
The 35 ns trr at 3 A forward current is the headline figure for a fast-recovery diode: it determines the reverse-recovery charge that must be swept out before the diode blocks, which directly sets the turn-off loss in a boost or flyback converter. At 600 V blocking, the leakage current is only 3 µA at rated voltage, keeping off-state dissipation negligible. Forward voltage is 1.7 V max at 3 A — this is the conduction-loss floor. At 3 A average, the forward dissipation is about 5.1 W, which the DO-201AD axial package must sink through the lead wires and board copper. The 175°C maximum junction temperature provides margin for high-ambient operation in enclosed power supplies. Packaging options include Cut Tape (CT) and Tape & Box (TB), both suited for through-hole assembly lines. The DO-201AD body is a standard axial-lead package with a 0.210-inch body diameter, compatible with existing PTH board layouts.
Voltage and package delta vs the closest siblings
The STTH3R04RL is the 400 V sibling with identical 35 ns trr and 3 A rating in the same DO-201AD package — the only difference is the reverse voltage ceiling. The STTH3R06S is the surface-mount version (SMC package) with the same 600 V / 3 A / 35 ns specs, for designs that prefer SMD over through-hole. The STTH5L06 is a 5 A, 600 V part with a slower 95 ns trr — it handles more current but trades recovery speed for it.