When choosing a rectifier, you have to consider its different parameters in the context of your requirements, static parameters such as forward voltage and leakage current and dynamic parameters such as reverse recovery time and parasitic capacitance. Schottky rectifiers are typically a good choice in terms of efficiency, but they have a high leakage current at high temperatures and bear the risk of uncontrolled self-heating, which we call “thermal runaway”. On the other hand, Fast recovery rectifiers (or PN rectifiers) are rugged and thermally stable, but the overall system efficiency can suffer from high conduction losses. Silicon Germanium rectifiers combine the best of both worlds in the sense that they are thermally stable, allowing a safe operation up to 175°C, and have the same efficiency as a Schottky rectifier.