The 780 mV forward voltage drop at 7.5 A is typical for a Schottky in this voltage class, keeping conduction losses manageable in a 15 A total output leg.
ST lists the STPS15SM80CG-TR as Obsolete. That means no further factory orders are accepted, and the part is not being manufactured. For a BOM line that still calls out this order code, the only channel is surplus inventory — sealed reels or cut tape from factory overruns, distribution closeouts, or broker stock. The date-code spread and packaging condition matter here: a reel with a single production date-code is preferable to a mixed-lot tube. We source these against an RFQ, confirming availability and pricing at quote time — no stock promise on the page, but the desk can check what is physically on hand.
The 80 V Vr rating gives headroom on a 48 V rail (derating to 60% is comfortable) but is tight for a 60 V rail if you follow the common 80% derating guideline — that leaves 64 V, so a 60 V rail is at the limit. The 7.5 A per diode is the DC average; in a forward converter or OR-ing application the actual RMS current may be higher, so check the I²R heating against the package's thermal impedance. The 20 µA leakage at 80 V and 175°C maximum junction temperature are typical for a Schottky of this voltage class — leakage doubles with temperature, so at high ambient the self-heating must be budgeted. The 780 mV Vf at 7.5 A is the forward drop at rated current; at lighter loads it drops, improving efficiency in standby.