Original Part
Alternative Part
1. TL431AIZ-AP Substitution Conclusion
The TL431AIZ-AP generally matches the original part in terms of reference voltage (2.495V vs. original 2.5V) and tolerance (±1%). However, its temperature coefficient is unspecified, which may result in poorer temperature stability compared to the original's typical 50ppm/°C and could degrade accuracy over wide temperature ranges. More critically, its minimum cathode current is 700 µA (original only 40 µA). In low quiescent-current or low-power circuits, the TL431AIZ-AP may fail to start up or maintain stable operation, and will increase system power consumption. It can be considered as a substitute if the application is not sensitive to temperature variation or quiescent current and has sufficient supply current; otherwise, careful evaluation is required.
2. LM431ACZX Substitution Conclusion
The LM431ACZX shares the same reference voltage (2.5V) as the original part, but has a worse tolerance (±2% vs. original ±1%), which reduces output voltage accuracy and affects precision reference applications. While its temperature coefficient is identical (typical 50ppm/°C), its minimum cathode current is as high as 1 mA (original 40 µA). This similarly limits its suitability in low-power designs, potentially increasing power dissipation or preventing proper circuit operation. If the application has relaxed requirements for accuracy and quiescent current, and the package is compatible (both TO-92-3), it can serve as a cost-effective alternative, though with compromised performance.
Analysis ID: EF14-63E3000
Based on part parameters and for reference only. Not to be used for procurement or production.
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