1. Reverse Leakage Current (Ir @ Vr): The VS-20CTQ045PBF is rated at 2 mA, whereas the MBR2045CT-LJ-01 is rated at 100 µA. The leakage of the former is 20 times that of the latter. Under high-temperature, high-reverse-voltage operating conditions, the VS-20CTQ045PBF will generate significantly higher static power dissipation and thermal loss. For efficiency-sensitive or battery-powered applications, the MBR2045CT-LJ-01 holds a distinct advantage. 2. Maximum Junction Temperature (Tj Max): The VS-20CTQ045PBF is rated for 175°C, while the MBR2045CT-LJ-01 is rated for 150°C. The Vishay device theoretically permits a higher internal operating temperature or offers greater thermal design margin, potentially providing more robustness under extreme thermal or overload conditions. The Diodes device has a lower designed operational temperature ceiling. 3. Qualification and Grade: The MBR2045CT-LJ-01 is explicitly marked as "Automotive" grade and is AEC-Q101 qualified. The VS-20CTQ045PBF carries no such designation. The MBR2045CT-LJ-01 meets automotive electronic reliability standards in terms of materials, manufacturing process, and testing, making it suitable for automotive environments (e.g., higher vibration and temperature cycling requirements). For automotive or other high-reliability fields, a qualified part is either mandatory or strongly preferred.