1. AS431BZTR-G1 Substitution Conclusion The AS431BZTR-G1 can serve as a substitute for the LM431CCZ/NOPB in most general-purpose applications, provided key differences are evaluated. The maximum output voltage is reduced from 37 V to 36 V, which may preclude its use in rare high-voltage scenarios requiring above 36 V. The tolerance shifts from -0.6%/+0.4% to ±1%, indicating a slight reduction in voltage accuracy that could affect designs with stringent reference voltage precision requirements. However, the temperature coefficient improves from 50 ppm/°C to a typical 20 ppm/°C, giving the AS431BZTR-G1 better stability over temperature variations, which can enhance overall system performance. If the application’s maximum voltage does not exceed 36 V and the ±1% tolerance is acceptable, the substitution is feasible and may offer potential benefits due to the improved temperature coefficient.