Original Part
Alternative Part
1. TL431ACZ Substitution Conclusion
The TL431ACZ (STMicroelectronics) aligns with the core functional parameters of the original TL431AILPE3 (TI) — adjustable output voltage (2.495V–36V), 100mA output current, and ±1% tolerance. However, two key differences exist: first, its cathode current (600µA vs. 700µA) is slightly lower, which may cause minor deviations in startup behavior or dynamic response under extremely low-power conditions; second, its package is described as TO-92-2 (TO-226AC), requiring verification of pinout compatibility with TI’s TO-92-3 variant. If the application is not sensitive to quiescent current and the package matches, it can serve as a direct replacement. However, in high-precision or low-power designs, actual performance should be validated.
2. TL431ACLPG Substitution Conclusion
The TL431ACLPG (onsemi) also fulfills the basic voltage reference function, but its differences are more pronounced: its cathode current is notably higher at 1mA (a 43% increase over TI’s 700µA), leading directly to higher quiescent power consumption, making it unsuitable for power-sensitive applications such as battery-powered systems. Its advantage lies in the clearly specified typical temperature coefficient of 50ppm/°C, offering better temperature stability. The package is a TO-92-3 long-body type, and physical compatibility should be confirmed. If the application prioritizes temperature stability and can tolerate higher static current, substitution is feasible; otherwise, careful evaluation is required in low-power designs.
Analysis ID: F0E9-7ED8000
Based on part parameters and for reference only. Not to be used for procurement or production.
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