55 ns trr — why this diode exists
The STTH30RQ06WY is a 600 V, 30 A fast-recovery epitaxial diode from STMicroelectronics, AEC-Q101 qualified for automotive power-train and chassis applications. Its 55 ns reverse recovery time (trr) puts it in the ultrafast class for a 600 V / 30 A die — fast enough to keep switching losses manageable in hard-switched boost PFC stages, DC-DC converters, and motor-drive freewheel paths running at 50–150 kHz. The DO-247 through-hole package handles the junction-to-case thermal path for 30 A average current; the 2.95 V forward drop at 30 A means the thermal design must budget roughly 88 W of conduction loss plus switching losses, so a heatsink or forced-air flow is assumed for continuous operation.
Junction temperature and automotive screening
Rated operating junction temperature spans -40°C to 175°C, which covers under-hood and transmission-oil environments where ambient can exceed 125°C. For a buyer sourcing this for an ECU or inverter BOM, the AEC-Q101 certificate and ST's own traceability system are the provenance chain to verify — the date-code laser etch on the DO-247 body should match ST's factory marking standard for the plant and week code.
Active status, no LTB pressure
ST lists the STTH30RQ06WY as an active product.