What this diode brings to a PFC or SMPS stage
The STTH5L06B-TR is a 600 V, 5 A standard fast-recovery rectifier from STMicroelectronics, housed in a surface-mount DPAK (TO-252-3) package. The 175 °C maximum junction temperature gives thermal headroom in confined enclosures or high-ambient industrial environments.
95 ns trr — the switching-speed anchor
The 95 ns reverse recovery time is the headline switching parameter. For a 600 V boost diode in a PFC stage, that trr keeps reverse-recovery losses low enough to avoid excessive heating in the diode itself and reduces turn-on losses in the companion MOSFET.
DPAK package — board-level fit
The DPAK (TO-252-3) is a common surface-mount power package with a tab for heatsinking. It reflows on a standard lead-free profile. The tab carries the cathode; board layout must allocate enough copper area for thermal dissipation at 5 A average current.
ST lists the STTH5L06B-TR as Active with no EOL notice or last-time-buy date. ROHS3 compliance is confirmed, so the part passes the EU RoHS exemption roll-up.