1. Current Capability - STPS41H100CGY-TR: 20A - NRVBB20100CTT4G: 10A The current rating of the onsemi device is half that of the ST part. If the original design operates near 20A, substitution will likely cause overheating and potential failure. Actual operating current and thermal management must be strictly verified. 2. Reverse Leakage Current - ST: 10 µA @100V - onsemi: 100 µA @100V The onsemi device exhibits a leakage current ten times higher. In high-temperature or high-voltage applications, this will increase static power loss, potentially affecting system efficiency and thermal performance. This parameter is critical for low-power or high-ambient-temperature designs. 3. Qualification & Grade - ST: AEC-Q101 qualified, designated as "Automotive" grade. - onsemi: No qualification noted (only specified with industrial temperature range). If the original application is automotive, replacement with the onsemi part forfeits the automotive-grade reliability assurance. Compliance verification would need to be re-established. 4. Technology & Product Family Focus - The onsemi device belongs to the "SWITCHMODE™" family, optimized for switching power supplies. - The ST device does not emphasize a specific family but offers higher current capability. Their application focus differs: the former may prioritize high-frequency switching performance, while the latter emphasizes high current handling. Evaluation must consider the specific power topology. Recommendation: If substitution is being considered, the following conditions must be met: actual operating current ≤ 10A, the system is insensitive to higher leakage current, and the application does not require automotive-grade qualification. Additionally, thermal performance and switching characteristics must be tested to ensure compatibility with the original design.