TURBOSWITCH fast recovery in a TO-220 pair
The STTH806TTI is a STMicroelectronics TURBOSWITCH series fast recovery standard diode, configured as a pair of series-connected diodes in a single TO-220-3 through-hole package.
The 30 ns reverse recovery time places this diode in the fast-recovery class (≤500 ns, >200 mA). In a continuous-conduction-mode PFC boost stage or a high-frequency rectifier, a 30 ns trr cuts the reverse-recovery charge that the MOSFET or IGBT must absorb at turn-on, reducing switching loss and ringing. The 600 V blocking voltage covers off-line rectified rails up to 400 V nominal with margin.
Mounting and thermal path
The TO-220AB Insulated supplier device package provides electrical isolation between the tab and the heatsink — no insulating washer needed, though thermal compound still helps. The through-hole TO-220-3 body is a standard footprint; the series-connected pair shares the common cathode tab.