Original Part
1. LM431ACZX Substitution Conclusion
This device can serve as a substitute, but with degraded performance. The impact on system accuracy and temperature stability must be evaluated.
The key differences between the LM431ACZX and the original AS431BZTR-G1 are accuracy (±2% vs. ±1%) and temperature coefficient (50 ppm/°C vs. 20 ppm/°C). The LM431ACZX exhibits larger initial output voltage error and more pronounced voltage drift over temperature. It is suitable for applications where reference voltage accuracy and temperature drift are not critical, such as non‑precision regulation or over‑voltage protection circuits. If the original design relies on tight voltage tolerance or operates over a wide temperature range, direct substitution may affect overall system performance.
2. LM431BCZX Substitution Conclusion
This device can be considered a direct replacement, though minor voltage deviation and temperature coefficient differences should be noted.
The main distinctions between the LM431BCZX and the original AS431BZTR-G1 are nominal output voltage (2.495 V vs. 2.5 V) and temperature coefficient (50 ppm/°C vs. 20 ppm/°C). While both share the same ±1% accuracy, the LM431BCZX has a slightly lower typical output voltage and a higher temperature coefficient, which could lead to somewhat larger output voltage deviation at elevated temperatures. For most general‑purpose reference or feedback circuits, this difference is usually acceptable. However, in precision measurement or wide‑temperature applications, verify that the output voltage range and temperature drift meet the design requirements.
Analysis ID: 3AF2-F6BD000
Based on part parameters and for reference only. Not to be used for procurement or production.
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