Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2.21% 100 mA TO-92-3
1. TL431IZ-AP Substitution Conclusion
The TL431IZ-AP is a low-feasibility substitute. Key deviations include a significantly wider tolerance (±2.21% versus the original ±0.4%) and an unspecified temperature coefficient. Additionally, its package is listed as TO-92-2, which may be physically or electrically incompatible with the original TO-92-3 footprint. In precision-critical applications—such as precision voltage references or regulation circuits—this substitution would notably degrade output voltage stability and accuracy. The expanded tolerance can increase system error, while the undefined temperature coefficient introduces thermal drift risk. Package mismatch may lead to mechanical mounting or electrical connection issues. Therefore, this part is only suitable for non-critical, limited-temperature-range applications where the package can be adapted.
2. LM431ACZX Substitution Conclusion
The LM431ACZX presents moderate feasibility as a substitute. Variations include a tolerance relaxed to ±2% from ±0.4% and a slight output voltage increase from 2.495V to 2.5V (a ~0.2% shift). However, its temperature coefficient remains a typical 50ppm/°C, and it shares the same TO-92-3 package. In non-precision applications—such as general power management or over-voltage protection—this substitution may be acceptable. The minor voltage offset can often be tolerated or adjusted in circuit, and while the wider tolerance reduces absolute reference accuracy, it may not impair basic functionality. Consistent temperature coefficient ensures comparable thermal stability. Thus, it can serve as a replacement where high precision is not critical, provided the circuit’s sensitivity to the voltage shift is verified.
Analysis ID: 72EF-0298000
Based on part parameters and for reference only. Not to be used for procurement or production.
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