Alternative Part
1. TL431ACZ Substitution Conclusion
The TL431ACZ can serve as a limited substitute for the LM431AIZ, with two key differences requiring attention: its nominal output voltage is slightly lower (2.495V vs. 2.5V) while offering higher accuracy (±1% vs. ±2%), which can improve system reference precision. Its cathode operating current requirement is lower (600µA vs. 1mA), which may shift the operating point under the original circuit’s bias conditions. Additionally, the temperature coefficient is not specified, potentially affecting stability across the full temperature range. Substitution is feasible if the circuit is insensitive to absolute reference voltage and temperature drift, and stability under the lower cathode current can be verified.
2. TL431ACLPG Substitution Conclusion
The TL431ACLPG is a highly compatible substitute for the LM431AIZ. Apart from the accuracy difference (±1% vs. ±2%), key parameters are well aligned: the nominal output voltages are effectively equivalent (2.495V vs. 2.5V, considered the same specification), both require 1mA cathode current, and both specify a typical temperature coefficient of 50ppm/°C. The higher accuracy benefits system performance, and the packages are compatible (TO-92-3 long-body). This part can directly replace the LM431AIZ without peripheral circuit adjustments. Moreover, as both are onsemi products, process consistency is better assured.
Analysis ID: 0562-CDE8000
Based on part parameters and for reference only. Not to be used for procurement or production.
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