1. Reverse Recovery Time (trr): GI504: 2 µs (standard recovery); EGP30G: 50 ns (fast recovery) - The EGP30G switches approximately 40 times faster than the GI504, which can significantly reduce switching losses and noise in high-frequency circuits (e.g., SMPS, inverters). In low-frequency applications like line-frequency rectification, this advantage is not realized, and other parameter differences may even introduce drawbacks. 2. Forward Voltage Drop (Vf) Under Different Test Conditions: GI504 rated 1.1 V @ 9.4 A; EGP30G rated 1.25 V @ 3 A - The GI504’s Vf is specified at a current well above its rated value, suggesting better conduction margin. The EGP30G’s higher Vf at its rated current may lead to greater conduction loss at the same 3 A operating point, requiring assessment of actual temperature rise. 3. Junction Capacitance Difference: EGP30G: 75 pF; GI504: 28 pF - The significantly larger junction capacitance of the EGP30G can result in higher capacitive turn‑on losses at high frequencies (partially offsetting its fast‑recovery benefit) and may affect EMI performance. 4. Temperature Range and Cost: - The EGP30G offers a wider junction temperature range (–65 °C), making it suitable for extreme environments, but its cost is about 2.5× that of the GI504. For most industrial applications where –50 °C is sufficient, this advantage provides limited value, and cost‑effectiveness must be weighed. Summary of Practical Implications: If the substitution targets high‑frequency switching circuits, the EGP30G’s fast recovery can improve efficiency. However, the overall thermal impact due to its higher conduction loss (Vf) and capacitive loss (larger Cj) must be re‑evaluated. For line‑frequency rectification or other low‑frequency circuits, the replacement not only fails to leverage the fast‑recovery advantage but may also introduce unnecessary performance degradation and higher cost due to increased Vf and component price.