8A, 200V, 35ns — what these ratings actually mean for your PFC or flyback
The STTH802SF is an 8 A average rectified, 200 V reverse voltage fast recovery diode from STMicroelectronics, part of the ECOPACK®2 series. The 35 ns reverse recovery time (trr) is the number that matters most in a switching supply — it dictates the turn-off losses in a PFC boost stage or the ringing in a flyback snubber. At 8 A continuous, this diode handles the output of a 1–2 kW PFC stage without breaking a sweat, provided the heatsinking accounts for the 175°C max junction temperature. The 6 µA reverse leakage at 200 V rated voltage is low enough that it won't contribute meaningfully to standby losses, but watch the leakage at elevated junction temps — it climbs exponentially. The TO-277A (SMPC) package is a 3-lead PowerDFN with an exposed pad that needs a good thermal via pattern to pull the heat into the board copper.
Active production, ROHS3, and what that means for your BOM
STMicroelectronics lists the STTH802SF as Active (current production) with ROHS3 compliance. The ECOPACK®2 designation means the package materials meet ST's own environmental standard — lead-free, halogen-free, and compliant with the current RoHS directive. This simplifies compliance paperwork for EU-bound equipment.
Sourcing and supply posture
Sourced through independent distribution channels, the STTH802SF is quoted to order against your BOM quantity. Availability and current pricing are confirmed at RFQ time — no stock-holding claim is made here, but the part is actively produced so lead times are typically manageable.