Original Part
Shunt Voltage Reference IC Adjustable 2.5V 37 VV -0.6%, +0.4% 100 mA TO-92-3
1. TL431BCLP Substitution Conclusion
From the perspective of key electrical parameters and package, the TL431BCLP can serve as a direct replacement for the original part LM431CCZ/NOPB. The differences are as follows: First, its nominal reference voltage is 2.495V compared to the original's 2.5V. However, this 5mV deviation falls entirely within the overlapping tolerance bands of both devices (TL431BCLP: ±0.4%, i.e., ±10mV; Original: -0.6%/+0.4%, i.e., -15mV/+10mV). Statistically, the actual voltage of the vast majority of units will be compatible. Second, its maximum cathode-to-anode voltage is 36V, which is 1V lower than the original's 37V. There is a potential risk only in extreme cases where the application circuit's input or set voltage exceeds 36V but remains below 37V; most common low-voltage applications are unaffected. In summary, for typical applications, this part is a viable substitute.
2. LM431CCZ Substitution Conclusion
This part can serve as a substitute in most non-precision applications, but note that its accuracy grade is reduced. The key difference lies in its initial accuracy (tolerance) of ±0.5%, which is inferior to the original's -0.6%/+0.4% and the TL431BCLP's ±0.4%. This may lead to greater dispersion in the actual reference voltage within a single lot or across different lots. For circuits with stringent requirements on absolute output voltage accuracy (e.g., high-precision measurement, ADC reference), it could introduce larger system error. Other characteristics, such as the 2.495V nominal voltage and 36V maximum voltage rating, are consistent with the TL431BCLP and compatible with the original part. It can be used as a replacement in cost-sensitive applications where the absolute precision of the reference voltage is not critical, such as power supply feedback or over-voltage protection circuits.
Analysis ID: 0578-6C38000
Based on part parameters and for reference only. Not to be used for procurement or production.
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