Original Part
Alternative Part
1. TL431IZ Substitution Conclusion
The TL431IZ can serve as a functional substitute in most cases; however, careful evaluation of key downgrades is required. Its accuracy (±2.21%) is notably lower than that of the original part (±1%), which may more than double the output voltage deviation. Moreover, no temperature coefficient specification is provided, posing potential stability risks over wide temperature ranges. Additionally, its package is marked as TO-226-2/TO-92-2, which may differ in pin layout or dimensions from the original TO-92-3 long-body version—mechanical compatibility should be verified. Therefore, substitution is acceptable in non‑precision circuits where accuracy and temperature stability are not critical, provided actual temperature drift and package fit are confirmed.
2. LM431AIZ Substitution Conclusion
The LM431AIZ can be used as a near‑equivalent substitute, with two notable differences: its reference voltage is specified as 2.5 V (compared to 2.495 V for the original), and its accuracy is ±2% (versus ±1%). This results in slight deviations in both output voltage absolute value and accuracy range. That said, its temperature coefficient (50 ppm/°C) matches the original part, offering comparable thermal stability, and the package is compatible. Hence, direct substitution is feasible in medium‑to‑low accuracy applications where the absolute reference voltage accuracy is not stringent (e.g., an error <0.5% is acceptable), though the impact of voltage tolerance on the system should be reviewed.
Analysis ID: 4704-F43F000
Based on part parameters and for reference only. Not to be used for procurement or production.
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