35 ns reverse recovery — what it buys the power train
The STTH1506DPI is a 600 V, 15 A fast-recovery rectifier from STMicroelectronics, built for the output stage of switch-mode power supplies and PFC boost circuits where reverse-recovery charge directly eats into efficiency. Its 35 ns trr keeps the recovery spike short enough that a 100 kHz hard-switched boost stage doesn't need a snubber on the diode alone — the stored charge clears before the MOSFET turns back on. Forward drop is 3.6 V at the full 15 A rated current, so the conduction loss at that point is about 54 W; in practice the average current is lower, and the thermal design needs to pull heat out of the DOP3I-2 tab efficiently.
Package and mounting — DOP3I-2 insulated tab
That saves assembly time and keeps the thermal resistance consistent. The insulation rating matters for the 600 V working voltage: the creepage distance on the package body is designed for that rail, but the heatsink itself still needs to be at a safe potential or grounded per the system's insulation coordination. Mounting is straightforward with a screw through the tab hole; torque to the recommended value in the datasheet.