1. Output Configuration and Capability: The PDSE1 provides dual outputs of ±15V, whereas the R1SE is a single-output +15V device. The PDSE1 can power circuits requiring symmetrical positive and negative rails, such as operational amplifiers and analog signal processing circuits. The R1SE can only supply a single positive rail. If the original design relies on a negative voltage rail, direct substitution will cause system failure. 2. Efficiency and Thermal Performance: The PDSE1 has a typical efficiency of 83%, significantly higher than the R1SE's 76%. Under the same output power, the R1SE exhibits higher internal power dissipation (approximately 0.24W vs. 0.17W), leading to potentially higher operating temperatures. In high ambient temperature or confined spaces, closer attention to its derating curve is required, which may impact long-term reliability. 3. Isolation Voltage: The R1SE offers a higher isolation withstand voltage (2kV) compared to the PDSE1 (1.5kV). This gives the R1SE an advantage in applications requiring higher insulation strength to withstand more severe transients or meet stricter safety requirements. 4. Package and Pinout: The two devices have different package dimensions and pin assignments. The PCB layout must be redesigned; a pad-compatible drop-in replacement is not possible. This increases the engineering cost and risk associated with substitution.