1. AZ431AZ-ATRG1 Substitution Conclusion This device is a fully compatible substitute. The AZ431AZ-ATRG1 from Diodes Incorporated offers complete functional, pin-to-pin, and key electrical parameter compatibility with the onsemi TL431ILPRPG. Furthermore, its primary performance specifications are significantly superior to those of the original part, specifically in terms of reference voltage accuracy (±0.4% vs. ±2.2%) and temperature coefficient (20ppm/°C vs. 50ppm/°C). Direct replacement with the AZ431AZ-ATRG1 not only achieves identical circuit functionality but also provides the system with higher voltage reference accuracy and improved temperature stability. This substitution represents an ideal upgrade path, contributing to enhanced overall product performance and consistency.