2. AZ431BZ-ATRG1 Substitution Conclusion The AZ431BZ-ATRG1 is also a fully compatible substitute for the original AS431BZTR-G1. Its published technical parameters are identical to those of the AZ431BZ-ATRE1, including the superior ±0.8% tolerance, adjustable voltage range, current capability, and TO-92 package. Similar to the -ATRE1 variant, the key improvement over the original part is the enhanced voltage reference tolerance, increased from ±1% to ±0.8%. This upgrade allows the AZ431BZ-ATRG1 to reduce system error attributable to the reference source's inherent deviation. It represents a performance gain for analog circuits or voltage monitoring applications demanding higher precision. Typically, the suffix difference between "-ATRE1" and "-ATRG1" likely indicates non-technical variations such as ordering packaging (e.g., tape and reel vs. tube) or environmental compliance markings. Their electrical performance can be considered identical.