Original Part
Alternative Part
1. TL431IZ Substitution Conclusion
The TL431IZ is compatible with the original part in terms of core functionality (adjustable shunt reference, 36V voltage rating, 100mA output) and package. However, a key deviation lies in its reference voltage accuracy (±2.21% vs. ±0.4%), and no temperature drift coefficient is specified. In applications requiring a high-precision voltage reference or stable operation over a wide temperature range—such as precision power supplies or measurement circuits—the voltage error of the TL431IZ may increase significantly, making it unsuitable as a direct replacement. It is only recommended for general regulation or protection circuits where reference accuracy is less critical, with due consideration given to potential temperature stability risks.
2. LM431AIZ Substitution Conclusion
The LM431AIZ aligns closely with the original part in electrical parameters (36V voltage rating, 100mA output, 50ppm/°C temperature drift) and package. Two primary differences exist: its reference voltage nominal value is slightly higher (2.5V vs. 2.495V), and its initial accuracy is lower (±2% vs. ±0.4%). In most applications insensitive to absolute voltage value—such as error amplifier feedback or switching power supply compensation—the LM431AIZ can serve as a functional substitute. However, its inferior accuracy will increase system reference voltage deviation by approximately fivefold, rendering it unsuitable for high-precision reference or calibration circuits. Prior to substitution, verify that the output voltage tolerance meets design requirements.
Analysis ID: 0795-2B27000
Based on part parameters and for reference only. Not to be used for procurement or production.
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