1. Recovery Speed & Frequency Suitability: The 1N4005 is a standard recovery diode (trr=2µs), suitable for line-frequency (50/60Hz) rectification. The MURA260T3G is a fast recovery diode (trr=75ns), capable of operating at significantly higher frequencies (e.g., secondary-side rectification in switch-mode power supplies, typically tens of kHz). In high-frequency circuits like SMPS, using a standard recovery diode by mistake will lead to severe switching losses and thermal failure. 2. Current Capability & Conduction Loss: While the MURA260T3G has a higher rated current (2A) than the 1N4005 (1A), its forward voltage drop (typical value unspecified, but generally higher) is likely greater than the 1N4005's 1.1V at the same 1A current. Consequently, conduction losses and heating in the substitute part may be increased under identical operating current, necessitating a re-evaluation of the thermal design. 3. Package & Thermal Characteristics: The 1N4005 uses an axial-leaded package (DO-41), relying on its leads for heat dissipation. The MURA260T3G is a surface-mount device (SMA), which depends on PCB copper traces for cooling. This fundamental difference in thermal paths and thermal resistance can result in a significantly higher junction temperature for the substitute part on an actual PCB than initially estimated. Thermal layout optimization and temperature testing are therefore mandatory. 4. Design Compatibility & Standardization: The 1N4005 belongs to the ubiquitous "1N400x" industrial standard family, offering broad supply chain availability and strong design interchangeability. The MURA260T3G is a standalone part number. Its general applicability is weaker in scenarios requiring series voltage/current selection or secondary source qualification.