The 550 mV forward voltage drop at 10 A keeps conduction losses manageable in a 20 A total-output design. With a fast recovery time of ≤ 500 ns, it suits switch-mode power supply secondary-side rectification, OR-ing diodes, and freewheeling clamps in 45 V or lower rails. The D2PAK (TO-263) surface-mount package allows board-level assembly on a copper island for thermal spreading.
STMicroelectronics lists the STPS20L45CG as obsolete. No official successor part number appears in the record, so a like-for-like drop-in replacement from the same manufacturer is not documented.
Ratings that drive the fit decision
The 45 V reverse voltage sets the bus ceiling — adequate for 24 V and 36 V rails but leaves no headroom for a 48 V system. The 10 A per-diode average rating sums to 20 A total with both diodes conducting, but the D2PAK package's thermal resistance means derating is necessary above 100 °C ambient; the 150 °C maximum junction temperature is the hard limit. The 550 mV forward drop at 10 A is typical for a 45 V Schottky of this die size — expect higher Vf at cold start and lower at elevated junction temperature. The ≤ 500 ns recovery is fast enough for 100–200 kHz switching, though a SiC or ultrafast silicon diode would be needed above 400 kHz.