1. Reverse Leakage Current (Ir): The STPS10150CFP specifies 2 µA @ 150V, whereas the MBR10150CTF-G1 is rated for 100 µA. Under high temperature and high reverse voltage conditions, the ST device exhibits significantly lower static power loss, reduced self-heating, and contributes to higher system efficiency. 2. Electrical Parameter Guarantees: While the nominal forward voltage (Vf) is identical, definitions of test conditions and statistical distributions (e.g., typical vs. maximum values) may vary between manufacturers. ST typically enforces tighter parameter consistency controls, while the Diodes part may be more cost-optimized. 3. Reliability and Application Positioning: The 2.4x price differential reflects not only the leakage current performance but is also typically associated with differing reliability standards (e.g., failure rates), quality control processes, and brand premium. The ST device likely targets industrial or automotive markets with greater emphasis on long-term reliability, while the Diodes component is geared toward cost-sensitive commercial applications. Substitution Recommendation: Direct substitution is acceptable for general-purpose applications such as switching power supply rectification or freewheeling. For high-temperature environments or circuits with strict turn-off loss limitations, the STPS10150CFP offers a distinct advantage. For cost-driven applications at room temperature, the MBR10150CTF-G1 represents an economical choice. Post-replacement validation of actual temperature rise and efficiency under high-temperature conditions is advised.