1. Peak Reverse Voltage (Vr): The 1N4002-TP is rated at 100V, compared to 50V for the 1N4001GP-E3/73. This provides a greater voltage safety margin when using the 1N4002-TP in the same circuit, representing a direct performance upgrade. The key consideration is verifying whether the original 50V rating was sufficient; if so, the substitution carries no risk. 2. Operating Junction Temperature (Tj): The 1N4002-TP range is -55°C to 150°C, while the 1N4001GP-E3/73 range is -65°C to 175°C. The notable difference is the 25°C lower maximum junction temperature of the 1N4002-TP. In high-temperature environments or applications with significant self-heating, the 1N4002-TP offers less thermal design margin, potentially requiring more stringent heatsinking or derating. 3. Junction Capacitance (Cj): The 1N4002-TP has a typical Cj of 15pF (@4V), higher than the 8pF of the 1N4001GP-E3/73. The larger junction capacitance may lead to increased switching losses and more pronounced noise coupling in high-frequency switching or noise-sensitive circuits. This is not a concern for 50/60 Hz line-frequency rectification but requires careful evaluation in applications like switch-mode power supply secondary-side rectification. 4. Manufacturer & Series: The 1N4001GP-E3/73 belongs to Vishay's "SUPERECTIFIER®" series, which typically emphasizes high surge current capability (the specific I_FSM value is not explicitly stated in the datasheet, but this series generally features a higher rating). The 1N4002-TP is not marked as part of a special series. This could lead to unspecified differences in tolerance under extreme surge conditions, though the impact on standard applications is likely minimal.