1. AS431BZTR-E1 Substitution Conclusion From the perspective of key electrical parameters and package, the AS431BZTR-E1 can essentially serve as a pin-to-pin direct replacement. The differences are as follows: its initial accuracy is relaxed from ±0.4% to ±1%, resulting in a wider absolute output voltage deviation at room temperature. This makes it potentially unsuitable for applications demanding stringent reference voltage accuracy, such as high-precision measurement circuits. However, its typical temperature coefficient is improved from 50ppm/°C to 20ppm/°C, meaning its output voltage exhibits less drift over temperature across a wide operating range, offering superior temperature stability. For the vast majority of applications where extreme absolute accuracy is not critical (e.g., standard power supply feedback loops, voltage monitoring) and stability over the operating temperature range is of greater concern, it represents a viable substitution option.