Original Part
Shunt Voltage Reference IC Adjustable 2.495V 37 VV ±2.2% 100 mA TO-92-3
Alternative Part
1. TL431CLP Substitution Conclusion
The TL431CLP can generally serve as a substitute for the LM431ACZ/NOPB. Both are adjustable shunt voltage references from the same TI product family, sharing identical package (TO-92-3), output voltage range (starting from 2.495V), output current (100mA), and tolerance (±2.2%). The primary differences lie in the TL431CLP’s slightly lower maximum operating voltage (36V vs. 37V) and the absence of a specified temperature coefficient. For the vast majority of applications operating below 36V, this voltage difference is negligible. However, if the original design relies on the LM431ACZ’s 37V rating or its well-defined low drift characteristic (50ppm/°C), the voltage margin and temperature stability should be reassessed. Under typical accuracy and voltage requirements, the TL431CLP can be considered a direct replacement.
2. AS431IAZTR-G1 Substitution Conclusion
The AS431IAZTR-G1 can be used as a higher-performance alternative, but key parameter differences must be considered. It offers superior tolerance (±0.5% vs. ±2.2%), providing better initial accuracy. However, its cathode operating current is significantly lower (50µA vs. 1mA), which may affect circuits designed with higher minimum bias current—verification is needed to ensure stable startup under this lower current condition. Additionally, slight adjustment in nominal output voltage (2.5V vs. 2.495V) and unspecified temperature coefficient are potential limitations. If the application demands high initial accuracy and the circuit can accommodate low cathode current, the AS431IAZTR-G1 can be substituted to enhance performance; otherwise, reference stability and dynamic response should be revalidated.
Analysis ID: 0B26-C978000
Based on part parameters and for reference only. Not to be used for procurement or production.
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