1. Recovery Speed: The EGP30G is a fast‑recovery diode (trr = 50 ns), whereas the 1N5404RLG is a standard‑recovery diode (>500 ns). When switching from conduction to cutoff, the EGP30G exhibits much lower reverse recovery charge and extremely short recovery time, which significantly reduces switching losses, noise, and voltage spikes in applications such as switching power supplies and high‑frequency rectification. If substituted in low‑frequency scenarios like line‑frequency rectification, this advantage is not realized. However, if it replaces a standard‑recovery diode in a switching circuit, efficiency and reliability can be improved. 2. Forward Voltage Drop (Vf): At 3 A, the maximum Vf of the EGP30G is 1.25 V, higher than the 1.0 V of the 1N5404RLG. Under the same operating current, the EGP30G will have higher conduction loss and generate more heat (approximately 0.75 W additional), requiring stricter thermal management. This is a typical trade‑off associated with its fast‑recovery characteristic. 3. Package and Thermal Performance: The EGP30G uses a DO‑201AD package, which is slightly larger than the DO‑201AA of the 1N5404RLG. The EGP30G may offer better heat dissipation, helping to cope with its higher conduction loss. Physical space compatibility should be verified during installation. 4. Capacitance and Leakage Current: The EGP30G specifies a junction capacitance (75 pF) and exhibits lower leakage current (5 µA). Lower leakage current helps reduce static power loss, while a defined junction capacitance is critical for designing high‑frequency circuits. The 1N5404RLG does not provide capacitance data, making it difficult to part in high‑speed applications. Summary: The EGP30G is a fast‑recovery diode suited for high‑frequency switching applications; the 1N5404RLG is a standard rectifier diode intended for low‑frequency rectification. When replacing the latter with the former, special attention should be paid to whether the increased heat dissipation is acceptable and whether the higher cost is justified. The reverse substitution (using a standard‑recovery diode in place of a fast‑recovery diode) is not feasible in switching circuits, as it would lead to severe heating and potential failure.