1. Rated Current & Forward Voltage (Io & Vf): The MURA260T3G's rated current (2A) is double that of the BA158GH (1A). At the same operating current, the MURA260T3G offers a greater current margin, potentially leading to lower operating temperatures and improved reliability. Note that their Vf test conditions differ (2A for MURA260T3G vs. 1A for BA158GH), so the Vf values are not directly comparable, though both fall within the typical range for this class of device. 2. Reverse Recovery Time (trr): The MURA260T3G's trr (75 ns) is half that of the BA158GH (150 ns). This indicates a faster switching speed for the MURA260T3G. In high-frequency applications like switching power supplies, this can effectively reduce switching losses and noise, thereby improving efficiency. However, in circuits sensitive to di/dt, the faster recovery may induce higher reverse recovery current spikes, necessitating circuit compatibility assessment. 3. Package & Mounting: This is the most direct physical constraint. The BA158GH uses an axial leaded package (THT), while the MURA260T3G is a surface-mount device (SMD). Replacement requires PCB layout redesign and consideration of SMD thermal management practices (e.g., thermal pad design). 4. Operating Junction Temperature Range & Certifications: The MURA260T3G offers a wider junction temperature range (-65°C to 175°C), with a 25°C higher upper limit, providing better thermal reliability in high-temperature or high-power-density environments. However, the BA158GH is explicitly marked with an "Automotive" grade and "AEC-Q101" certification, which are mandatory for automotive electronics applications. The MURA260T3G datasheet does not indicate this certification. For automotive use, compliance must be confirmed with the manufacturer; otherwise, it is not a valid substitute. 5. Manufacturer & Process: onsemi, as a leading international supplier, typically offers more comprehensive process consistency and reliability data. For applications where long-term stability and failure modes are critical, this difference should be taken into account.