Original Part
Alternative Part
1. TL431IZ Substitution Conclusion
From an electrical performance and packaging perspective, the TL431IZ can serve as a direct replacement for the TL431ILPE3. Their core parameters, including the adjustable voltage range (2.495V-36V), maximum cathode current (100mA), and minimum cathode operating current (1mA), are identical. The only differences lie in the initial accuracy, where the TI part is specified at ±2.2% versus ±2.21% for the ST part—a negligible 0.01% deviation for the vast majority of applications. The other difference is the package description: TL431IZ is noted as TO-226-2/TO-92-2, while the original part is TO-226-3/TO-92-3. However, this typically represents only a variation in manufacturer drawing nomenclature for the same standard TO-92 three-pin package; the physical dimensions and pinout are essentially identical. This constitutes a functionally equivalent substitution.
2. LM431AIZ Substitution Conclusion
The LM431AIZ represents a high-performance alternative, offering core functional compatibility and alignment of key parameters. It shares the same adjustable output voltage range (up to 36V) and current capability (100mA) as the original part. The differences are as follows: firstly, its initial accuracy is superior (±2% vs. ±2.2%), providing more precise factory-set output voltage; secondly, it explicitly specifies a typical temperature coefficient (50ppm/°C), a parameter not documented for the original part, suggesting potentially better voltage stability and predictable performance across a wide temperature range for the LM431AIZ; finally, its nominal output voltage is 2.5V, a mere 0.005V difference from the original part's 2.495V, which is typically inconsequential in application. The LM431AIZ is not only a viable replacement but may offer comparable or superior performance in terms of accuracy and temperature characteristics.
Analysis ID: 286A-30EF000
Based on part parameters and for reference only. Not to be used for procurement or production.
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