1. Current Rating: The MBR2060FCT-BP is rated for 20A (per diode), whereas the DSB20C60PN is rated for 10A. The DSB20C60PN has only half the current-handling and power dissipation capability, making it prone to thermal failure under the same operating conditions. 2. Forward Voltage (Vf) Test Condition: The Vf of the MBR2060FCT-BP (950mV) is specified at 20A, while the Vf of the DSB20C60PN (730mV) is specified at 10A. These values are not directly comparable as they are measured at different current levels. Typically, for devices of the same technology, the higher-rated part (20A) would exhibit a lower Vf when measured at the same current (e.g., 10A). 3. Order-of-Magnitude Difference in Reverse Leakage Current (Ir): At 60V reverse bias, the leakage current of the MBR2060FCT-BP is 50µA (microamps), while the DSB20C60PN's is as high as 6mA (milliamps)—a 120x difference. This results in significantly higher static power loss and temperature rise in the off-state for the DSB20C60PN, adversely affecting efficiency (especially under light load) and high-temperature stability. 4. Maximum Junction Temperature: The DSB20C60PN has a Tjmax of 175°C, slightly higher than the 150°C of the MBR2060FCT-BP. While this is an advantage on paper, the substantially higher leakage current may cause the DSB20C60PN to reach its thermal limit at a lower practical operating temperature, negating much of this benefit. 5. Package Thermal Path: The MBR2060FCT-BP features an "Isolated Tab" configuration, requiring an insulating pad during mounting, which adds to its thermal resistance. The DSB20C60PN uses a "Full Pack" (typically non-isolated) design where the metal backplate is electrically connected to the die, offering a better thermal path. However, this necessitates insulation from the heatsink. Crucially, the DSB20C60PN's halved current capability largely offsets this thermal design advantage. Summary: The DSB20C60PN is not an equivalent or a derated substitute for the MBR2060FCT-BP. Its primary limitations are the halved current capability and excessively high reverse leakage current. It is only suitable for applications with significantly lower power levels and where off-state losses are not critical. If the original design's current requirement is near 20A, substitution is not viable.