85 ns trr — the recovery time that defines the application
This trr value is the key parameter for designs that need to minimise switching losses in continuous-current-mode rectification or snubber networks — a 85 ns recovery lets the diode turn off before the next switching edge arrives in a typical 50-100 kHz PFC stage.
600 V / 2 A — voltage and current headroom
Rated 600 V reverse voltage and 2 A average forward current, the STTH2L06RL is sized for line-voltage rectification in off-line power supplies, PFC boost stages, and flyback snubbers. The forward voltage is 1.3 V at 2 A, which sets the conduction loss floor — at full load that is 2.6 W, so the DO-41 axial package needs adequate lead-length cooling or a heatsink clip in free-air convection.
The STTH2L06RL carries an official obsolete product status. STMicroelectronics no longer manufactures this specific date-code range. No official successor is listed, so replacement is a parametric match search (600 V, 2 A, 85 ns trr, DO-41) rather than a drop-in substitute from the manufacturer.
DO-41 axial — mounting and thermal reality
The DO-204AL (DO-41) axial package with through-hole mounting is a workhorse for point-of-sale and appliance PSUs. Reverse leakage is specified at 2 µA at 600 V, but expect this to rise exponentially with junction temperature — derating the reverse voltage below 80 % of rating above 125 °C junction keeps leakage within budget.