1. AS431BZTR-G1 Substitution Conclusion From a core functionality and pin-compatibility standpoint, the AS431BZTR-G1 can serve as a direct substitute for the TL1431CLPRE3. However, there are notable differences in key performance parameters. The primary deviation is a reduction in reference voltage accuracy from ±0.4% to ±1%. In applications with stringent initial accuracy requirements, this may lead to increased dispersion in the output voltage reference, potentially impacting overall system precision. On the other hand, the AS431BZTR-G1 explicitly specifies a typical temperature coefficient of 20ppm/°C, providing a basis for evaluating its stability across the full operating temperature range—a parameter not documented for the original part. Substitution is viable in cost-sensitive applications where the initial voltage accuracy requirement does not exceed ±1%. For high-precision systems, however, the impact of reduced accuracy and temperature drift on system specifications must be evaluated prior to replacement.