1. Switching Characteristics and Losses: The gate charge (Qg) and input capacitance (Ciss) of the R6015KNX are significantly lower than those of the FCPF260N60E (approximately 55% and 58%, respectively). At the same switching frequency, the R6015KNX exhibits lower drive losses and switching transition losses, which is beneficial for improving system efficiency, reducing temperature rise, and enabling operation at higher frequencies. 2. Conduction Characteristics and Losses: The FCPF260N60E has a lower on-state resistance (Rds(on)) (approximately 11% lower). In applications with continuous current conduction or extremely high duty cycles, it offers a slight advantage in conduction loss. 3. Current Rating and Thermal Design: The 15A current rating of the FCPF260N60E is specified at a junction temperature (Tj) of 150°C, whereas the R6015KNX rating is based on a case temperature (Tc) of 25°C. The former more directly reflects the die's thermal capability, while the latter requires conversion using thermal resistance parameters for a fair comparison. The higher power dissipation rating of the R6015KNX (60W vs. 36W) is primarily attributed to its TO-220FM package, which likely has a lower thermal resistance. Actual heat dissipation capability should be evaluated with reference to the specific junction-to-ambient thermal resistance (RθJA). 4. Threshold Voltage: The gate threshold voltage (Vgs(th)) of the R6015KNX is higher (5V vs. 3.5V). It is essential to ensure the drive voltage is sufficiently high (typically >8V) to achieve full turn-on and avoid operation in the linear region, which would cause excessive heating. Conversely, this higher threshold provides slightly better noise immunity.