Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.25% 100 mA TO-92-3
1. FAN431AZXA Substitution Conclusion
The FAN431AZXA is a viable direct replacement. It maintains complete compatibility with the original TL431CLPRPG in core technical specifications (such as adjustable output range, maximum voltage, output current) and package (TO-92-3 through-hole). The key improvement is its initial reference voltage accuracy, which is enhanced from ±2.2% to ±1%. This upgrade provides a deterministic improvement in system voltage reference precision without requiring any circuit modifications. Other parameters, including temperature coefficient, remain unchanged. Therefore, it enables a seamless drop-in replacement with enhanced performance.
2. TL1431ACZ-AP Substitution Conclusion
The TL1431ACZ-AP poses risks as a direct replacement and requires careful evaluation. While it is compatible in terms of reference voltage and withstand voltage range, and its initial accuracy (±0.25%) is significantly superior to the original part, two critical differences exist. First, its temperature coefficient of 90ppm/°C is substantially worse than the original's typical 50ppm/°C. This will result in greater output voltage drift over temperature, degrading the system's temperature stability. Second, its required cathode operating current is 600µA, differing from the original's 1mA. This discrepancy may introduce minor deviations in the original circuit's performance, particularly in designs sensitive to specific bias currents, such as dynamic impedance or startup characteristics. It is not an ideal "plug-and-play" substitute. It is better suited for new designs where high static accuracy is prioritized and temperature drift sensitivity is low.
Analysis ID: 072F-AF24000
Based on part parameters and for reference only. Not to be used for procurement or production.
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