1. Voltage and Current Ratings: The SIHA11N80E's 800V Vdss is significantly higher than the NTPF360N65S3H's 650V, making it suitable for applications with higher bus voltages or requiring greater voltage margin (e.g., 800V bus PFC). Its 12A (Tc) nominal current is also higher than the latter's 10A (Tj). However, the different current test conditions (Tc vs. Tj) make a direct comparison imprecise. Actual current-carrying capability must be evaluated in conjunction with thermal resistance and power losses. 2. On-Resistance and Conduction Losses: At comparable test currents, the NTPF360N65S3H's Rds(on) (360mΩ) is significantly lower than that of the SIHA11N80E (440mΩ). Under the same conduction current, the former generates lower conduction losses, leading to higher efficiency. This is particularly critical for medium-low frequency or continuous conduction mode applications. 3. Switching Performance: The NTPF360N65S3H's Qg (17.5nC) is far lower than the SIHA11N80E's (88nC), and its Ciss is smaller. This indicates the former has extremely fast switching speed and low switching losses, making it highly suitable for high-frequency switching applications (e.g., LLC resonant topologies). The latter's high Qg demands a more robust gate drive and results in higher switching losses, limiting its operational frequency. 4. Thermal Design Margin: The SIHA11N80E's nominal Pd (34W) is higher than the latter's (26W), but the actual maximum power dissipation is determined by the package thermal resistance and system cooling conditions. Combined with its higher conduction and switching losses, this may lead to a higher junction temperature in the same application, necessitating a re-evaluation of the thermal design. Summary of Core Differences: The NTPF360N65S3H (SuperFET III) is a MOSFET optimized for high frequency and low losses, ideal for high-efficiency, high-frequency topologies. The SIHA11N80E is a high-voltage, medium-current part whose performance is tailored for conventional frequency designs, with switching characteristics being its primary limitation. Substitution requires a comprehensive re-evaluation of losses, gate drive, and temperature rise.