1. AS431BZTR-G1 Substitution Conclusion The AS431BZTR-G1 can serve as a functional replacement for the TL431BQLPRE3, though key performance trade-offs must be considered. The primary differences lie in reference voltage accuracy (±1% vs ±0.5%) and cathode current (1 mA vs 700 µA). The reduced accuracy doubles the initial error tolerance of the reference voltage, which may impact circuits with stringent voltage precision requirements, such as precision measurement or ADC reference applications. The higher cathode current increases the device’s quiescent power dissipation by approximately 43%, making it less suitable for low-power or high-temperature designs. An advantage is its specified temperature coefficient (20ppm/°C), which is not documented for the original part, offering better performance predictability over a wide temperature range. If the application is not sensitive to initial accuracy or ultra-low power consumption, and requires guaranteed temperature coefficient performance, this substitute can be used.