1. Power Rating & Package Thermal Performance: The CMHZ5236B (500mW, SOD-123) offers 2.5 times the power rating of the DDZ9693S-7 (200mW, SOD-323). The SOD-123 package also provides superior thermal dissipation. Under identical operating conditions, the CMHZ5236B exhibits lower temperature rise and higher reliability, or can potentially handle higher surge and steady-state currents if the application permits. 2. Reverse Leakage Current (Ir): Under test conditions near the nominal zener voltage (~6V), the leakage current of the CMHZ5236B (3µA) is significantly higher than that of the DDZ9693S-7 (100nA). When operating at voltages below the regulation point, especially in high-temperature environments, the CMHZ5236B will contribute to greater quiescent power dissipation. This difference is non-negligible for battery-powered devices or high-impedance sensing circuits, potentially impacting standby current or measurement accuracy. 3. Dynamic Impedance (Zzt): The CMHZ5236B specifies a maximum dynamic impedance (6Ω), whereas this parameter is not provided for the DDZ9693S-7. Within its regulation region, the CMHZ5236B has a defined upper limit for its impedance characteristics, allowing its load regulation performance (the variation of output voltage with load current) to be estimated. The performance of the DDZ9693S-7 in this regard is uncertain. In demanding voltage regulation applications, post-substitution verification of load regulation is necessary to ensure requirements are met.