1. Substitution Conclusion for AZ431BZ-ATRE1 From the perspective of core functionality and package, the AZ431BZ-ATRE1 can serve as a substitute for the original part. However, its initial accuracy (±0.8%) is notably inferior to the original's (±0.4%). In applications with stringent requirements for absolute initial output voltage precision, a direct substitution could lead to system output deviations exceeding the design tolerance. On the other hand, its temperature drift coefficient (20ppm/°C) is superior to the original's (50ppm/°C), indicating better output voltage stability over varying operating temperatures. The feasibility of substitution is highly application-dependent. It can be used in scenarios where initial accuracy is not critical (e.g., adjustable via circuit trimming) but stability over the operating temperature range is prioritized, such as in standard switching power supply feedback loops. In high-precision reference or measurement circuits with hard requirements for initial accuracy, this part is not a suitable direct replacement.