What this 600 V, 30 A fast recovery diode is for
The STMicroelectronics STTH3006DPI is a 600 V, 30 A fast-recovery epitaxial diode with a 45 ns reverse recovery time (trr), housed in a DOP3I-2 insulated through-hole package with straight leads. It is designed for continuous-current-mode power factor correction (PFC), output rectification in switch-mode power supplies, and snubber/freewheeling applications where low switching losses matter. The 45 ns trr keeps the reverse-recovery charge small enough to reduce EMI and switching dissipation in hard-switched converters running above 50 kHz.
A 45 ns reverse recovery time at 30 A forward current and 600 V blocking voltage puts this diode in the class that suits continuous-conduction-mode PFC stages and high-frequency output rectifiers. The fast turn-off reduces the overlap loss in the MOSFET or IGBT it pairs with, and the soft-recovery characteristic (typical of ST's Turbo 2 family) helps control ringing without aggressive snubbing. If your design runs above 100 kHz switching frequency, the recovery charge still stays manageable — check the Qrr curve in the datasheet for your specific di/dt and temperature.
Forward drop and thermal budget at 30 A
Maximum forward voltage is 3.6 V at 30 A, which sets the conduction loss at roughly 108 W peak. That number drives the heatsink sizing — the DOP3I insulated package is designed for bolted mounting to a heatsink through the M3 hole in the tab, and the junction temperature maxes out at 150 °C. In practice, at 30 A average with a 50 % duty cycle in a PFC stage, you are looking at a substantial extruded heatsink or forced air.
For a new design going into production, this means you can qualify it without building a life-cycle buy contingency into the BOM. The base product number is STTH3006, and the DPI suffix identifies the DOP3I insulated package variant.