1. AZ431AN-ATRE1 Substitution Conclusion From the perspective of core electrical performance and package compatibility, the AZ431AN-ATRE1 can serve as a substitute for the original part NCP431BCSNT1G. The key differences are as follows: First, it offers superior initial accuracy (±0.4% vs. ±0.5%) and a better temperature coefficient (20ppm/°C vs. 50ppm/°C). This translates to a more stable and precise reference voltage over the entire operating temperature range, which can enhance overall system accuracy. Second, there is a notable discrepancy in the datasheet nominal value for "Current – Cathode" (1 mA vs. 100 mA). This requires careful verification. If Diodes' 1mA specification represents the minimum cathode operating current while onsemi's 100mA is the maximum cathode current, the circuit design must ensure the shunt resistor is configured to maintain a cathode current above this minimum (typically 1mA). As long as this condition is met and the device's absolute maximum current rating is not exceeded, the substitution remains viable. Both devices share an identical package (SOT-23-3) and adjustable voltage range (2.5V to 36V), enabling a direct pin-to-pin replacement.