Alternative Part
1. TL431AILPG Substitution Conclusion
The TL431AILPG can directly substitute the LM431ACZ and generally represents a performance upgrade. Both share identical core architecture and key parameters (e.g., output voltage range, cathode current, temperature coefficient). The primary differences are the TL431AILPG's nominal reference voltage of 2.495V (0.2% lower than the LM431ACZ's 2.5V) and its higher initial accuracy (±1% vs. ±2%). For the vast majority of applications, the TL431AILPG is a drop-in replacement that provides a more precise voltage reference, thereby improving overall system accuracy. Substitution should only require verification in the rare cases where the design has a strict, explicit dependency on the 2.500V nominal value, to confirm the acceptability of this 5mV offset.
2. TL431ILPG Substitution Conclusion
The TL431ILPG can substitute the LM431ACZ, but this constitutes a downgrade in terms of precision and must be evaluated against the application's accuracy requirements. The devices are electrically and mechanically compatible. The key distinctions are the TL431ILPG's nominal reference voltage of 2.495V and its lower initial accuracy (±2.2% vs. ±2%). Its absolute output voltage error range may be slightly wider than that of the original part. Substitution is viable in applications where the absolute accuracy of the voltage reference is not critical—for instance, when used solely in an error amplifier feedback loop rather than as a reference for a high-precision ADC. However, if the original design already utilizes the full ±2% accuracy margin, the replacement could introduce marginally higher system error.
Analysis ID: 7442-8CE0000
Based on part parameters and for reference only. Not to be used for procurement or production.
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