1. AS431BZTR-G1 Substitution Conclusion Direct substitution is not recommended and should only be considered for non-critical circuits with extremely low requirements for reference voltage accuracy and extreme cost sensitivity. Its ±1% initial tolerance is significantly inferior to the ±0.25% of the original part, leading to greater output voltage variation between individual units or across different production lots. This will directly degrade system reference accuracy, making it unsuitable for applications requiring precise voltage comparison or feedback. Although its temperature drift coefficient (20ppm/°C) is better than the original part, and key parameters such as maximum operating voltage and current capability are consistent, its cathode operating current (1mA) is also higher than the original (600µA). This will slightly increase quiescent power consumption, and the drive capability of the supply circuit must be re-evaluated when performing the substitution.