1. Technology Type & Current Capability The SBR3U20SA-13 utilizes Super Barrier Rectifier (SBR) technology with a 3A rating, while the PMEG2010ER,115 is a conventional Schottky diode rated for 1A. The SBR offers higher effective current density and superior resistance to thermal runaway, making it suitable for higher-power or more demanding thermal environments. 2. Forward Voltage (Vf) Under Different Test Conditions The SBR's 390mV@3A and the Schottky's 340mV@1A are not directly comparable. At the same current (e.g., 1A), the SBR typically exhibits a lower actual Vf, resulting in lower conduction loss. The Schottky's Vf rises more sharply at higher currents, leading to a faster decline in efficiency. 3. Reverse Leakage Current (Ir) & Temperature Characteristics The SBR's leakage (500µA) is half that of the Schottky (1mA). Furthermore, SBR technology inherently features a flatter leakage-temperature curve. In high-temperature environments, the SBR demonstrates significantly lower static power dissipation and better thermal stability, which is critical for high-temperature applications or efficiency-sensitive designs. 4. Package Thermal Resistance & Power Handling The SMA (DO-214AC) package has a lower junction-to-ambient thermal resistance (θJA) compared to SOD-123W. In practice, even at the same operating current, the SMA package can dissipate higher continuous power, allowing for either a higher ambient temperature or a reduced thermal design margin. 5. Junction Temperature Range The SBR specifies the full operating range of -65°C to 150°C, whereas the Schottky only lists a maximum of 150°C. This indicates the SBR provides more reliable and clearly guaranteed performance for low-temperature startup or extreme temperature cycling applications. Engineering Recommendation: If the original design operates at ≤1A with ample thermal headroom, consider re-evaluating the thermal design and using a derated Schottky version for cost reduction. Otherwise, the 3A rating must be maintained, with priority given to the SBR or a similar high-performance alternative.