Dual Schottky rectifier for 60 V rails
The 570 mV forward voltage drop at 10 A is typical for a 60 V Schottky in this current class, keeping conduction losses manageable in a 20 A total-output design when the two diodes are paralleled or used in a center-tapped secondary. The fast recovery characteristic — ≤ 500 ns — is not the ultra-fast recovery of a silicon FRED but is adequate for line-frequency and moderate-speed switching supplies where the Schottky's low Vf and negligible reverse-recovery charge are the primary advantage.
Obsolete — plan for a replacement
The STPS20M60CG-TR is listed as obsolete. The 60 V blocking voltage, 10 A per-diode current, D²PAK footprint, and common-cathode pinout are the constraints a substitute must match. Expect to source this part through the surplus and broker channel, where date-code consistency and lot traceability become the primary authentication checks — the D²PAK laser etch and package marking should be verified against ST's known font and logo standards for the production period.
D²PAK footprint and thermal design
The STPS20M60CG-TR comes in the D²PAK (TO-263-3) surface-mount package with an exposed tab that carries the common-cathode connection. With a 150 °C maximum junction temperature, the designer must size the copper spread to keep Tj below that limit at the expected ambient and airflow. The reverse leakage of 65 µA at 60 V is a static loss component that rises with temperature, so the thermal budget should include that increase at the operating junction temperature.